I am 22 years old, male. Recently, whenever I drink alcohol, my face starts to turn red and hot and my eyes turn red too. My heartbeat goes slightly high and I can feel a strong and strange alcohol smell when I exhale. Everything goes down to normal within an hour or two. This does not happen everytime I drink. Sometimes I'm perfectly fine. I have been drinking since I was 18 and mostly drink on weekends and in moderation. This used to happen when I started drinking alcohol, but one day suddenly it stopped on its own and everything was perfect for 4 years until now. Can anyone help me out with this?