It sounds like you may be suffering from cubital tunnel syndrome. The ulna nerve which lies and moves thru the "funny boen" becomes trapped and cannot move easily. The first symptoms of this is numbnes of the pinky and ring finger. This numbness can also affect the outer side of the palm and the forearm as the damage to thenerve gets worse. You need to seek medical advice as soon as possible.
In the mean time bend your elbow as little as possible. Wrap your arm, not too tight at night, so that you do not bend it when you sleep.
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