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I am now having back problems just a few days later and not that long ago I actually tore some muscle fibers in my lower back. Perhaps I rolled "wrong" while asleep, re-injured the muscles and my brain just interpreted it as being struck.

That could be. Take it easy either way, back pain is no joke. I have occasional flare ups and it always puts me out of commision for a bit. I actually find myself sweating sometimes just from brushing my teeth because the pain is so bad.