Hi there
well, it sounds like you have done an immense amount of work to improve your health and really think about what you are putting into your system. I really take my hat off to you. As you point out of course, dropping a load of gluten, polysaccharides, alcohol etc onto that nice clean system will probably result in more of an impact.
In addition, I imagine that you may have previously masked some of the after affects by compensating with caffeine, sugars etc. Since you are now not doing that you get to feel all of those after effects in 'glorious' detail - the dehydration, the effects of the metabolites of alcohol in your system, possible disturbed sleep etc. Quite literally a bit of a shock to the system!
In my experience, drinking alcohol causes a great deal of anxiety, especially in a binge way - at least it does for me. And end to binging reduces this massively - for me at least - but it takes a few weeks.
All the best - sounds like you are doing some great work already!
CC