Craftybear, not being able to sleep and in pain is hard to bare. I am so sorry that you are going thru this. When I can't sleep I use one Tylenol PM. On the occassion that I have sciatica pain..I use a heating pad. Have you tried a mild sleeping aid..then add some advil? I have tried Advil PM..but..this will make you laugh. I woke up in the middle of the night and was so itchy..never used it after that.
A few months ago we invested a little money in a 3 inche memory foam mattress topper. I have to say..that was the best thing we ever did. Maybe this would help you sleep. It is rare that I don't sleep well. The pad has made mornings less stiff.
Hugs to you and praying that you find an answer to help you sleep.
Blessings