Banged elbow off bedroom door about half hour ago, sitting here at PC went to get up, as soon as I gripped the chair armrests to get up IYSWIM, there was a nasty pain in my elbow and I mean nasty. I am worried I might have done some damage, I can use the affected arm obviously as am typing with both hands now, but there is still an ache there. What could I have done and what should I do?