I had and am still having similar experinces. After practicing for about 3 months I developed an intolerance for alcohol and coffee. I have basically quit both. Maybe 5 drinks and 4 cups of coffee over the last 5 months. I tell people I quit by accident.
Recently I have found I can't handle very much red meat :-( The last 2 times I had steak I was miserable all night.
RodB