Alcohol intolerance

Hello! I am a 28 year old female. For the past 6 years I have been dealing with sudden alcohol intolerance. It started as a Welty red and hot rash all over the body and has now progressed to not only the rash but many other symptoms. I will say I was a frequent drinker in college and still like to drink with friends. Due to the current symptoms (only able to drink one drink before rash, sneezing, hot flashes, dizziness, and increase heart rate) with a total loss of the day after with an intense migraine, it is not enjoyable anymore.

I currently take 40 mg Pepcid and Allegra 180mg this combats the rash and no other symptom.

I have tried eliminating different alcohols. With no difference.

Doesn’t matter if I drink 1 drink casually or have a full night out. I feel the same dread the day after.

I just got DAO supplements as a last resort. Does anyone have any tips on how to utilize the DAO to full potential without over/ under doing it. Can I still take the pepcid and Allegra?