Advice to see your doctor is good. The heaviness you describe is probably a sign that your circulation was not up to moving the "products of combustion" out of the muscle as fast as you were making them.

Note that the artery that feeds the end of the arm passes near the surface and amongst a bunch of muscles and other stuff right at the inside of the elbow. Find it by feeling for a pulse with the arm straight.

If you were holding the tipple a little high, so that you had more than the usual bend at the elbow, you may have just suffered a "positional impairment of circulation." Any activity where the elbow doesn't move around a bit can cause it. It's not too uncommon after long sessions of "mousing" at the computer for some people.

It does seem to become more common with age (let's call that "growing up") and if it happens repeatedly, can be a symptom of a less than healthy circulatory system; so it does bear checking out. Of course there are other and more serious causes of reduced circulation that also should be eliminated.

John