I am doing continuous masturbation since 1 month. I enjoy it and can't resist from doing it but I feel pain after doing this. I have headache, back pain and so. I am not being able to stop this, how to stop it? What bad effects it will have on me?

Doctor can evaluate. Frequency of masturbation varies a lot. For some, once every 8 wks seems too much; but for others, once every 8 hrs seems not enough. One should maybe cut back if he or she often thinks of doing it less, if he or she starts feeling guilty about it, if it interferes with his or her daily activities such as school or work, etc. Headache and backache may be due to other causes. A doctor can examine.