I swing at a guy and hit his arm and after I hit him it hurt so bad and now it is swelling a bit and I can move it still
Well, the only sure way to find out is to go to the hospital and get an x-ray...they won't do much more than splint it even if it is broken.
Now...what did you learn?
It feel normal and I can move it normal just little swell up and it is not purple or green