Chloe, I am not going to outright reassure you, but I am going to say that the visual perceptive system is WILDLY complex and it might be useful to ask yourself how it is that you're sure what you're noticing is something WRONG and not something RIGHT!
"Oh but I've never noticed my body do that before" -- something which a pregnant person in labor could say, too. Does mean anything is "wrong"
"but it feels bad" -- same
If I turn my head sharply enough in certain angles I can *sometimes* see my own white blood cells zipping around in front of my retina. Freaky! Sometimes unpleasant! But really common, and not deadly. And actually, exactly how that's SUPPOSED to work.
Really, truly, Chole, at this point you're just like the person who was almost beside themselves that there was a big lump sticking out of their neck right where their spine was... it moved when they bent their neck forward... it was larger than the rest of their vertebrae... they were CONVINVED they were dying from a terrible tumor... They went to their doctor, and....
It was their C7, which anyone who has studied even a lick of anatomy knows is the largest of the cervical vertebrae... and SUPPOSED to be that way. Literally, it is used as a radiographic landmark for this reason. Their doctor, bless them, had a quick feel and then stared at them for a good minute before delivering the news in a "good news / bad news" format. The good news was of course that they were an anatomically correct human being. The bad news was, they had crippling health anxiety.
Keep up the anti-anxiety work!! We're rooting for you.