After about a week of taking diltiazem, I've started to feel a little funny a few hours after applying it. Mainly, I feel a little hot and edgy. Has anyone else experienced this?

I don't think I'm putting too much but, just in case, I'll start using less. I was told to take a "pea-sized" amount, so I basically put a thin coat on the top part a finger cot that I visualize is about the same volume as a pea. I suppose it could be slightly more, but not by much.