OUCH !!!!!
But do not worry, I have a cure, perform the following
rest left elbow on bar, using right hand , lift heavy glass of beer towards mouth, drain glass in one go to make lighter, slowly lower glass back to bar. Repeat, Repeat, Repeat, Repeat, Repeat, Repeat (pain should be getting less by now ) Repeat, Repeat, Repeat, Repeat, Repeat, Repeat.
You should have by now fallen over and have no pain in ankle, however, great pain in head later !!!!!!!!