Weird thing happens to my scalp sometimes

I have done so much googling and cannot find a single person who understands what I'm talking about. Every once in a while I must sleep in a weird position or something because I'll wake up with the skin on the back of my scalp all scrunched up and it takes a while to go back to normal. It often feels weirdly numb or tingly. This happened today for the first time in a while, but this time there's a big bump right where one of the folds was and it hurts really bad. It feels a little tingly too but mostly just hurts. It's a sharp pain that kinda feels like I had my hair tied up for too long right where the bump is.. I'm worried it might be a swollen vein on my scalp or something. I can't even look up without sharp pain in the bump. Does this weird scalp thing happen to anyone else? And do you think this bump warrants a doctors visit?