Oof, then you should really visit a doctor I think that everyone has an insurance so going to the doctor is free or something and even if it isn't believe me, a pain specially in the back can be quite a problem I talk from experience, my toe hurted from time to time and I ended up having a quite a big bruise between my toe fingers and they had to do something that hurted a lot, your problem isn't that physical, is more muscular but you should really check the doctor
