Floo it sounds very similar to me.
In June I suddenly started suffering with horrendous urticaria of unknown origin - I was off work for weeks with it. I ended up having monthly Xolair injections which eventually got rid of it. I've stopped those now (you have to) and the urticaria hasn't returned but I have been left with a whole raft of othet histamine related problems, and after much symptom keeping and trial and error, I now know for certain that it's Estrogen causing it. I have terribly prickly skin in the evenings, insomnia, eczema on my face, flushed skin and specifically where I apply the Lenzetto a dermatitis type rash. If I either increase my HRT or ovulate, the problems worsen terribly. When I reduce my HRT they disappear... but then I immediately get horrendous low E night sweats and insomnia. I'm caught in this horrendous limbo - it feels like there is too much Estrogen in my body and it's reacting against it and yet I can't lower my HRT without having withdrawal.
Do you have any other non skin type histamine symptoms or do you think yours is more an allergic reaction to the alcohol as you say?