Arm Injury. This or observe for a while?

Fell, injured arm 2 days ago. X-ray of Elbow negative. Symtoms: Initially swelling/ tenderness in area left of elbow. Slight discomfort in wrist. Today, onset of stiffness/tenderness on outside of R shoulder along with some aching. Have pretty good range of motion without much pain. (If not doing what I am about to describe.) What I'm concerned with now (and was not aware when I sawMD) is the following symptom:Since day one, I experienced pain when twisting, pushing or pulling but only when gripping or holding on to something or if my hand comes into contact with something. For example twisting my arm while holding onto treadmill bar or baby stroller in front of me, or pushing or pulling drawer or door open or shut. The above mentioned pain is sharp located in a wide area below elbow and goes away when I stop.Should I follow up on this or observe for a while? Right now I have my arm in sling to remind not to favor the arm. 67 yo F 5'6, good health and I work out. Thank you.