Masseter hypertrophy? Could Botox be the solution I've been looking for? (Photos)

I've had trouble with bruxism since childhood. I also often clench my jaw while awake. I've had problems with TMJ and headaches on that side since my teens. Recently, I've begun to notice the asymmetry. I think this also contributes to my neck and upper back pain. I never thought there was anything I could do. Could Botox be a solution for me? I'm not sure what kind of doctor to go to, and would I have to get this done every few months? Would it affect my ability to chew food? Thank you!