I think your underlying anxiety is creating this fear of what your body is going through right now.
in the GI category CAN include: nausea, diarrhea, dry mouth, loss of appetite, cramps, vomiting, constipation, GAS.................you stated you had pretty much all of these symptoms with the exception of dry mouth. So, do I think this stew of symptoms could POSSIBLY be related to a too fast w/d from Lexapro? Sure. (And do remember, I AM NOT A DOCTOR!!!!!