I've had my back do that a number of times on shore and twice out sailing. It is often debilitatnig to the point where getting up off the floor / deck takes 15 minutes.... I do some single handing and I was thinking about what I would have (or should) done if was alone. I could "drive" around and try to attract some attention..Get on the radio to see if I could get some help. Probably would have gone off channel a bit and toss an anchor over as it's only 15' deep and I have a light Danforth I could use. Then reassess...All you single handers ever think about what you'd do in an injurious situation?????
Case one on boat. Was off shore with teenage daughter. She sailed for about 12 hours into harbor. I was able to give some dirrection from the bunk, but that's about it. What if I had been alone? It was fair weather and I woud have simply headed out a bit more. It mostly passed in 2 days. The causative lift (convertable berth) has been redseigned to eliminate the lift.
Case two on a boat. Pulled it while raising anchor, alone. Solution? I put the anchor back down. Cause? I yanked on something stupidly in the early morning without any warm up. My windlass was being fussy. Still, I could have worked with it, as I was in no hurry. Since then, I up-graded to a better windlass.
Singlehanders need to be careful. Plan every move. Since you have only yourself, the weather, and the boat to consider, you should be clear headed; no crew distraction.