last thursday my right arm started being dodgy! i dont remember doing anyfin to bring it on! but i couldnt move my arm more than a cm away from my body, it has slowly been gettin better and i can pretty much move my arm! But i cannot put my arm out horizontally to my side, and i need to support it (with other arm) if i want to put it in the air, i have noticed that when i do a certain movement it feels like its locked! (it's when i try changin clothes and to take my top off lift from bottom with both hands and up over head, i get about half way and my right arm starts hurting and feeling kinda stiff and won't move any further) i have looked at my shoulders and arms and they look the same i dont know whats happened!