Looks like you have a lot of meds. I have asthma too and had a Ménière's-like problem in my late 30s and 40s (before my asthma attacked me :-) I know Ritalin can cause nasty effects/fainting, sudden blood pressure changes (which can drop one), etc. so if you are taking more than prescribed, especially with all the other meds, I'd say you have drug interactions/overdoses happening.