I've had this horrid right arm pain for about 4 days now, and it is killing me. Ever since I slept on my neck wrong 4 days a go, my arm won't stop hurting. It's not like a stabbing pain or anything. When I'm occupied, I don't really feel it. But 90% of the time, I can very much tell it's there. It's on the top of my right upper arm. Yes, I'm sure I'll get quite a few "see a doctor" answers, and I will, but I want to see if it's nessecary first. Thank you ahead of time for the answers! I'm only 15 by the way, so I don't think it's like arthritis.