I’m having an issue, as we speak (so to speak).
My beau is on his way over and perhaps, if I ask nicely, he’ll do that nifty lie on yer tummy with one leg bent and push on yer back thingy.
In the mean time, and anyone suggest anything - I’m really uncomfortable - my right leg is numb. 
When you back gets to working again, I suggest you get a copy of Accupressure’s Potent Points as it has some exercises in there that help. Without the illustrations, its kind of hard to do 'em, but I’ll give it my best shot to describe what you need to do.
Start out seated in a chair (using proper posture). Place your knuckles on your lower back, palms facing out. Rub vigourously for one minute to create warmpth and breathe deeply.
Next, place your hands at your waist with your thumbs on the ropelike muscles near the spine and your fingers wrapped around your sides. Apply pressure with your thumbs on the outer edge of those ropy muscles so that your thumbs are about four inches apart. Do this for at least one minute and apply as much pressure as you can without causing pain.
Then lie on your back and inhale. Use your arms to pull your knees up to your chest and exhale slowly while you hold your legs there. Let you knees come out, away from your chest and inhale. Repeat this for two minutes.
Relax after this with knees bent, feet flat on the floor, eyes closed, for at least three minutes.
Place your hands underneath your butt, palms down, beside the base of the spine. Close your eyes, take deep breaths and rock your knees side to side for 2 minutes.
Make fists and place them on your lower back, palms facing down, so your knuckles rest between your spine and your lower back muscles. Breathe deeply for one minute.
(Note to Mods, I’ve paraphrased this so it should be okay.) You may have to repeat all these execises a couple of times before you feel any improvement, and if you’re really having trouble (one time I had to get someone to fold my legs on to my chest), you’ll need to repeat them for a couple of days to make sure it stays away.
My right leg has a siatica problem also. I find the best stretch is to lie on my back on the floor and put my right leg in the air. Grab the leg and pull it back slowly toward your head until your hamstring is screaming. Then have a friend slowly help you push it back a little more until you just can’t stand the pain. Release and do this once or twice more. Relief will last for a day or two.
When alone,the easiest stretch for me to do is;Back on floor,knees bent grab knees with both hands and bring them to touch your chin if possible.Hold abt,10 secs.or so.Repeat maybe 5-10 times.This usually eases my back enough,if I’m in that “crick” condition that I can do the pull left leg (while lieing down on back) as far as possible trying to touch the opposite shoulder.These,when my back is loose enough,produce that satifying pop in my vertebra.
I’m on my second month with GCM and I’ve heard that popping when switching positions in bed rolling over from my side to back or reverse,inadvertantly.Must be working.
If the beau’s there the best I’ve found with a partner is to stand back to back,arms entwined at the elbows,then have them lean forward slowly,so you’re rising off the floor with your back bent over your partners’back.Just like being on the rack.Oh what a relief it is.
It helps if you weigh less than your partner 
Thanks for the tips guys. The back stretches were of great help. The only problem I have with the hamstring stretches/leg stretches, is that I’m actually TOOO flexible, and my leg hits my chest long before I feel a pull. However, this one:
helped quite a lot.
alice, get the book that one came from, I can’t stress enough how much it’s helped me. There were days I could hardly walk, the pain was so bad, now, thanks to the excercises in the book, I rarely have a problem. Glad to hear that it helped.
This page discusses sciatica: