I agree the meds won't interact, but.. why are you taking them? If you need to keep blood pressure low then DXM might harm you. It's not stimulant level of heart rate elevation, but it's not insignificant. And if you take valproate to prevent seizures then you're betting your basic neurological functionality every time you trip.
Helping people around psychiatric spells is one thing, but I'd hate the thought of helping people into blatant physical harm..