Do you have any fans in the windows? Putting a box fan directly in the window will draw in some nice cool air at night.
Take a cool shower at night right before bed. Having wet skin with air blowing across it helps cool you off (that’s why we sweat). If you can sleep naked, go for it. I usually hop in the shower and turn it to as cool as I can stand it, get soaked, and then turn it gradually colder as my body gets cooled down. Since I have a lot of hair, getting my scalp really really cold helps a lot.
Cool compresses or ice packs on the neck helps too like others have said.
Identify where the sun comes into the windows during the day. Keep those windows closed and keep the shades/blinds/curtains closed when the sun is coming through. If you’ve got everything open at night, make sure to close everything by 8 or 9 AM to keep the sun out. Open them back up once they are in the shade.
Don’t hesitate to spend some time outside in the shade. It’ll be less stuffy out there and you should get some nice cool breezes on your sweaty wet skin.
Shopping and movies are nice daytime activities. Although gas is expensive, driving in the car with the AC on can be refreshing.
Drink lots of ice water. I am not sure but I think caffineated drinks aren’t so good for keeping one refreshed.
Be glad it’s a “dry” heat. That’s what my goofy relatives in Phoenix always tell me while I’m suffering here in the Ohio humidity