Sorry, I am not on meds, or anything-- but I do know some times over the counter meds can react with other meds, and also just with a person if they aren't talking anything just due to One's individual make up...
just something to maybe think of?

just like some people, coffee doesn't perk and wake them up but yet they are "fine" just that coffee doesn't have the same effect as others..., or even weed doesn't get everyone high like the giggly way.

Maybe these things in the over the counter meds effect you differently.

Some over the counter meds also can effect people with high blood pressure and diabetes, even if they aren't taking meds for those things.

hopefully some one else can hop on and give more advice.