Symptoms can improve, though it can take a lot of time (I've been battling some symptoms for 37 years). Some have improved, but that is not an illness, that's a career.

Dizziness is one of my second-tier symptoms, but I do have problems with it from time to time. Let me ask you this, have you tried regular OTC anti-histamines? I discovered this trick while in an emergency room with one of my migraines. I may have to go 50% over the recommended adult dose, but it does seem to do the trick (always consult your physician).

Good luck.