All of a sudden I have become really allergic to alcohol within the past year. What causes this? Sometimes Im fine and sometimes I have a horrible reaction like right now Im having the worst reaction Ive ever had. I just had a small drink of a margarita and my face is blotchy red all over and I feel like my face is on fire, it actually hurts. I took benedryl and Im afraid to take more as Im already on some other medication so how do I get this allergic reaction to go away? All I had was one sip!