If I flex my right elbow all the way (not necessarily by contracting biceps hard), I feel a really sharp pain in my joint and it feels as if I'm over-flexing. It hurts at the very bottom of a dip and sometimes at the very top of a chin-up.

Note: it's not my muscles that are hurting though, it's my joint or something inside there. Anyone know what it is or had that before?

It's very annoying. Last night I was fine. Then I woke up at 5am and realised I was ****ed.