Are you allergic to mold/mildew? You mention that it's a new wetsuit but go on to say that you rinse it out after every day of diving so I suspect it's "been dove a couple of times" new versus brand new with no dives prior to this one. If it's wet and you don't properly dry it out mold can easily develop inside the suit. If you have an allergy to mold then... Just a thought.