Back pain, advice needed?

The other day I tried partial suspension for the 1st time, I was tied in a harness with 1 leg off the ground, that day I was fine but next day I woke up had a shower and then my back started hurting so bad I wanted to be sick, its been 3 days if pain and I don't know what's going on all I know is I'm in pain
Back pain, advice needed?
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