My Upper Arm, And I Think Elbow, Have Been Sore

My upper arm, and I think elbow, have been sore and the muscle is very tender to the touch, for about two or more weeks now. Then this week there is a pretty good size bruise just above the elbow on the top of the upper arm. It is painful if I use it to twist on a faucet or press with it to get up. Sometimes it starts aching bad for no reason. It has kept me awake aching a couple times when I lay on that side. The pain travels to my elbow and now up to the shoulder but not super painful when it does. Mostly the upper arm is the painful place.