My psychiatrist said there is "almost always some overlap with personality traits." Going just on what you've said, it sounds like you have traits of both.

Meds are helpful to some people and not at all to others. You just don't know until you've given them a chance. In my case they've never done me any good; they only caused really nasty side effects.

I relate a lot to what you've said in that you have had short periods of bliss, have felt connected to a greater consciousness, bouts of creativity, paranoia/anxiety, agitation, emptiness, etc..
A bipolar 1 diagnosis was bootstrapped to me after a stay in inpatient where the hospital pdoc thought I was having a mixed episode, but I was just reacting to very intense and internalized stress stemming from long unaddressed psychological problems, which has also caused a lot of problems with my mood. I'm hoping to get the diagnosis looked at since I don't meet the criteria very well. Borderline describes me much better, though I'm not confident that they will see it.

As long as you're getting the right treatment for your symptoms, try not to worry too much about the actual term they use.