Dear Welcome to HCM We understand your concerns I went through your details. I suggest you not to worry much. The problem you are mentioning could never be due to not masturbating but is due to the ill concepts. Masturbation is normal, natural and not unhealthy. Even animals masturbate. Your problem must have arises out of anxiety from the ill concepts of masturbation. Back pain and penis pain are due to anxiety and imagination from your end. Therefore do not worry. You might need sexological counseling and sex therapy. You can post a direct question to me in this website. Include every detail as much as you can. I shall prescribe some psychotherapy techniques to control your condition. I am sure that the techniques should be a success. Hope this answers your query. Available for further clarifications. Good luck.