Suffering from back ache. Have now quit.

A couple of days ago, i was taking my shower and i happen to catch a sprain in my left shoulder. I had horrible pain for the whole of that day in my back, a little below the left shoulder. The pain was so heavy that i had to leave office and rush to a doctor. Due to the pain, i presume it is due to the pain, i am getting heavy fever during the night and probably once, I got it during the day also. The pain was just at one spot. However, since the next day, my entire back started aching real bad. Today morning, when i got up, i got a feel that my back was tied up with ropes for a really long time and someone just released it. It was really hard and gave a very tight feel. As of now, pain is not that heavy, but then, the maximum i can sit at one place continuously is 5 minutes. The 6th minute, it starts to pain like hell. I used to masturbate on a minimum once a day, and it would go up to two and at times thrice also. I have dome this for four years straight. However, i have now quit.