I am having a shoulder dislocation often. How to cure it and what kind of treatments are available for that?

Once I was staying in room with my friends. It was about night and I went to bed. As I was wearing spectacles, I wanted to remove it and keep it on the table near by. I was already on bed and hesitating to step on floor I turned to put my spects to the table from my bed itself. Unfortunately my legs slipped and I fell down in such a position where my right arm on the table and legs on the bed with my middle body went down between the table and bed. I felt my shoulder twisted hardly. When I got up i was unable to move my arm and was having a pain. I went to bed within few seconds i became unconcious of severe pain. My friend showered water on my face which turned me on. The whole night I was unable to move my arm. Next day I wen to the doctor who prescribed an X ray. After checking it he told there is a swelling on the shoulder which shoul be kept in slings for 3 weeks. I did so within 2-3 days my pain disappeared. Then about six months later I played shuttle badminton for long time but had no effect on my injury. A 3 more months later I came to Saudi Arabia where the season was winter. I played badminton again, while making a serve my hand slipped out again and went back to its positin. It was so painful and i became disappointed and it happened again after 1 year while tryng to play the game again. When i came back to India I tried to play cricket. while throwing the ball in fast mode as all cricketers do, i was having no problem. but while throwing the ball as a fielder, I again felt my arm dislocating..then i feared to play. whats my problem here and how can i get it cured? pls someone help me....