Singular1, you’re links don’t work.
I’m about the same place where the OP is. Then again I’m struggling thru a bio of Pol Pot.
Might I suggest ‘Take the Cannoli’ by Sarah Vowel. Funny, and some short stories.
I second the GRR Martin recommendation. Also, consider short story anthologies. When you find an author whose story you like, look up other books by them. You’re bound to find something.
I also recommend trying new genres. I’m not a fan of non-fiction as a rule, but some I’ve read are Vamp: The Rise and Fall of Theda Bara (by our own Eve Golden), and Bruce Campbell’s autobiography. I’d never even heard of Theda Bara before, but the book kept me entranced all the way to the end, and Bruce Campbell’s book was quite amusing.
Hmmm - dunno what happened to the links. I can’t seem to make it work today for some weird reason. Anyways, if you go to amazon.com and enter Christopher Moore or Barbara Kingsolver, you’ll get a list of really good books that may mend your reading bones.
Tried Good Omens. Couldn’t make it that far into it.
My problem is that I’m a huge fantasy fan, but sometimes I just don’t have the ambition to settle into a big epic series. I have the first book of a Song of Ice and Fire sitting on my bookshelf for the last 3 years. I keep on getting sidetracked by smaller books. But try finding good serious character oriented fantasy that only lasts for one book. Any longer than that, and the book needs to have a serious gimmick for me to read it.
Have you read Tigana by Guy Gavriel Kay? One book, excellent characters, deeply involving story.
What worked for me is going to a church book sale. $5 a box. Classic, trash, various things it had a some point crossed my mind to read…what the hell it’s $5 and I have to fill up the box. Then I left it in the middle of the room…rummaged through it from time to time. Occasionly started a book and put it down for something completely different. But at this point I think I’ve finished the box (in fact it’s time for another book sale).
(And I’m not sure but I thought reading was more of a gland than a bone 
)
Completely different take – if you are getting older you might want to get your vision checked. I haven’t completely worked out the presbyopia/contacts/reading glasses thing yet and reading, previously one of my passions, holds less interest for me now because it is more work.
You do realize that Good Omens wasn’t written just by Pratchett, right? The style of that books isn’t quite like either Gaiman or Pratchett. Also, the Discworld books are only a series in the loosest sense. Most of the books could easily be stand-alones. I would never recommend that someone start at the beginning of the Discworld books and read them chronologically.
I routinely grab anything by Carl Hiassen. He writes excellent stories of the crazy and corrupt in Florida. A mad ex-governor named Skink sometimes emerges from the wilderness, and that’s always a treat.
I just finished Eleventh Hour by Catherine (not Ann) Coulter. Multi-faceted characters, imaginative plot. A good read.
If Haissen floats your boat, try anything by Tim Dorsey. Reads like John D. McDonald on acid. Truly bent characters, absurd situations and a ton of Florida History.
I know how you feel. I’m an obsessed reader who spends my whole life knee deep in piles of books, but somedays I just don’t have anything I want to read.
Do you like to re-read? When I get like that I find it’s comforting to retreat into books I already know I like, but read long enough ago that I don’t remember them exactly.
I like reading young adult and kid’s fiction, there’s a good reason some of them are classics. Try reading Anne of Green Gables again, or “The Secret Garden”, or Susan Cooper, Alan Garner or Elizabeth Goudge.
Try something different. Sometimes I just don’t want to read any fiction, so I hunt around for something interesting in the non-fiction line. What things are you interested in? Maybe look for something non-fiction in those areas. I love to read dog and horse training books, or books about animals generally, and books about food.
I’m also really enjoying some of the recent books in the non-fiction area which pick a single topic and use that as a prisim for examining society … one of the early classics in that field was “Much Depends on Dinner” by Margaret Visser, but there are a number of others published more recently. Because I’m interested in perfume I loved “The Emperor of Scent” and I even learned a little physics and biology along the way.
Maybe pick a couple of authors you haven’t read, who have a big back list? That way if you find someone you enjoy you’ve got lots of enjoyment ahead of you. I’m re-reading my way through Dick Francis at present because I’m feeling a little stressed and I want the comfort of a writer I know I already like.
If you’re looking for something along the lines of Tom Clancy, maybe look backwards a bit and try Alistair McLean? Or if you like thrillers, my most recent favourite writer in the area is Lee Child, a terrific writer, a great character and really terrific plotting.
Maybe just pick up a coffee-table book - mostly pictures but enough text that it counts as reading. You can find lots on the remainder table in any bookstore.
To go outside your usual genres of fiction:
SF: Cordwainer Smith - Short stories and one novel in a future history, very strange, allegedly told with the same structure as old Chinese literature.
Fantasy: Lord Dunsany - Shorts and one novel again. Trust me on this! Fifty-One Tales is a good start.
Hard-boiled mystery: Dashiell Hammett and Raymond Chandler - Some say DH started the form, and RC perfected it. DH had better plots, RC had better characters. Lawrence Block is an ecellent modern follower.
I could go on, but the idea of hitting a used book store is even better than taking suggestions. Look for the junk table, put down your hand, and take the first five non-fiction books you touch. It should only cost a few bucks, and who knows what you’ll find!