Are BP people more intelligent, intellectual, creative?

I was intelligent, intellectual, and creative until my mid-thirties. Then, alas, my bipolar tendencies took over my personality, and I started to do stupid things. Now, thanks to my illness and a full dose of medication, I show only flashes of my former brilliance and can only call myself ordinary.

I honestly feel like my mental health problems (and all of the relevant bad experiences I've had) have actually made me dumber over the years. I was very advanced as a child and had a very high IQ. I was formerly tested and placed in all advanced classes up until 10th grade (since I completely lost my marbles in 9th grade and was removed from school entirely for a little while). I can also remember the experience of being exceptionally intelligent. Everything was so easy, cognitively speaking. My brain was like a very powerful processor, able to rapidly absorb, analyze and put to use loads of information at a time. Experiences were quick, smooth and without stress when it came to cognitive performance.

But there has been a steady decline since my first major breakdown, over the years. By now in life (27) it is difficult for me to do basic math in my head if it involves more than a couple steps. My short term memory is not so great. My focus is not so great. Learning new procedures, systems and tasks takes a few times before I feel even remotely confident, and even then, I might still screw up if I'm just a little bit tired or stressed.

The other day at work, first I hit the wrong button on the cash register screen, and then because of that mistake, I had to figure out the change to give the customer in my head. Several years ago I would have reached the correct answer instantly, but in that moment it took me easily 30 seconds of doubtfully, anxiously trying to figure it out in my head - and I still got it wrong, gave him too much money.