Welcome Grandma,
Glad you are able to join our forum. You will meet alot of nice people here and get alot of good advice. I can't offer any thing about no sleep since I have insomnia. I have tried everything and have just been put on klonipin. (may have mispelled that). But I too have low back pain due to herniated disc in lumbar region. I use a heating pad when in pain, and if it's inflammed I use an ice pack. The wedge sounds like a good idea.
Anyway, hope this site helps. I know when I can't sleep at night I log on and come here. It 's nice to know we're not alone. Hope you feel better soon.
Yellwdaisy