I would seriously consider seeing a chiropractor. I used to get this pain constantly but it has resolved with this treatment (and the strengthening exercises).

these things can take a long time to heal but you could also try a physiotherapist

Sounds like a nerve problem, should subside soon, keep up with the exercises and meds if not bettr in a few weeks i’d go back to the dr and ask for a nerve test they can tell ya if its a pinched nerve.