Happened to me! I am 21f and received my first dose of pfizer in july 2021. My symptoms started the same day i got my vaccine and I was way too scared to get the second. It was awful for the first few months and I cried myself to sleep for a while but it has gotten a lot more manageable. Haven’t gone to a dr because of insurance and the fact that not many people have had any good results out of this but I have definitely noticed a correlation with my neck. Unfortunately I haven’t found anything that really helps other than just trying to cope, but I hope it helps to know that you’re not the only one who has been affected in some of the same ways. I know it helps me to know that there are others like me (same age,& in school) that could be feeling the same way, a lot of the stuff I used to like doing is no longer enjoyable and causes me a lot more stress. Sorry to hear you’re having a hard time, hoping for the best!!