I am not a doctor (I don't even play one on TV). But a friend of mine had a similar experience (he also described it as feeling like his blood pressure was drop

I am not a doctor (I don't even play one on TV). But a friend of mine had a similar experience (he also described it as feeling like his blood pressure was dropping, in addition to feeling heart flutters). After a number of tests, turned out he was having micro-seizures. He was prescribed an antiseizure medication and the symptoms stopped. The cardiologist didn't find it. He went to a neurologist, and that's who diagnosed him. Your situation could be completely different, but I thought I'd share the experience just in case.