Did something similar last month simply moving from one position to another sitting on the couch. It took a couple weeks to repair. WTF is all I can say. I lived on tylenol and just kept moving very carefully so the muscles wouldn't continue to stiffen. Mild heat.
Check out some physical therapy/back strengthening vids on the jewtubes pertinent to what part of your back is injured.
First time I ever hurt it I was scooting a chair in. Something I'd done tens of thousands of times before and since. But that time... The drive back home from college was not a fun one. I could barely walk for almost a solid week.
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