Kind of unrelated to specific back shots, but still a back injury post.
My mom had a bad back injury about 10 years ago. She lifted a 75 pound bag of water salt softener and hurt her back, then went on vacation to Mexico the next day. Needless to say, she and my dad came back early, she went to the ER and got steroid injections every 6 months as well as muscle relaxers (diazepam). I found that for her, her muscle shakes and pain (her legs would almost spasm) got really bad whenever she got cold, then she would get super anxious. This would fuel more muscle shakes which would then make her more anxious. Yes my mom has anxiety.
I found that helping her calm down severely decreased her pain and especially muscle spasms. (She was always worried the shakes and back injury were going to make her incontinent, thankfully they never did) I wonder if your anxiety could be at least somewhat affecting your pain as well. I know anxiety is never good in like 99 percent of cases.
Anyway she went to physical therapy and is doing way better now (she had a big improvement about a year after the injury), though she still gets anxious from time to time.
I hope your back feels better too! Hugs!!!