I busted my arm during badminton?

i recently played some badminton and i think i busted my right arm. i can still raise it and all that but when i reach for my back it hurts but otherwise it doesn't. after 4-5 days i tried playing again and whenever i hit the shuttlecock with force there's this blinding numb pain and i have to stop. what do u think is wrong with it my arm? and how long more do i have to wait for it to get healed because i really want to play soon!|||You likely bruised your arm, but it could be a torn ligament as well. I agree you need to check with a doctor and have it looked at. If you can afford it, you might want to do an MRI.|||You need to see a doctor..People on Yahoo Answers really wouldnt know