What Causes Progressing Twitches In Face, Hands And Legs?

Hi, I have been getting progressively worse twitches in my face (myokymia mainly) and hands (especially the digits of my left hand), and occasionally my legs for the last year or so. I have also started drinking a bit heavier this last year, but not crazily or excessively so - maybe 30-40 units a week (which I realise is over the 21 units I am allowed but I'm a student and I don't think this is a crazy amount for a student). It's starting to worry me a bit, so I was hoping you cold help, thanks a lot