When I lay on my back, I have no pain. Unfortunately, I have sleep apnea sometimes when sleeping on my back, so I mainly sleep on my sides. It doesn't matter which side, I still have that awful pain on my left side. Again, getting up and walking for a few minutes makes it go away.
I had two spinal injections at one appointment. They helped some for 3 days, but that's it. But, don't let that discourage you from getting them, there are tons of people that have had success with them.
Are you in more pain when you are up and moving around, or only at night? Have you asked your doctor about Gabapentin? It relieves my pain about 25%. That's better than nothing! I have to get up in the middle of the night to take it, and then I can sleep some better. It's longer between the times when the bad pain makes me get up and walk.
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