It will be way better than meeting with the GP. I did the GP for years- loved him and he did his best, but he is not a psychiatrist. I also met with a psychologist frequently for quite awhile. I was on an anti-D and had been on different ones over the years. Wellbutrin made me crazy manic. I merely thought I was crawling out of my skin and that staying up all night doing random crap was normal. Then, during a particularly hard time in my life, my psychologist told me that I really, really, really needed to meet with a psych. He suspected at the time that I had BP, but didn't say as much. He referred me to a colleague that he trusted.

At that time, I was horribly depressed, wanted to choke people, brain would NOT shut off, and it was going a thousand miles a minute. everyone talked too slowly, I was crawling out of my skin, and then randomly felt like flying off the interstate into the river... I didn't do it, but I was losing my mind and I was scaring me. There were a few times I felt homicidal. It was then that I met my angel - my psych, and life got better gradually. Then those episodes that I had over the years I learned were mixed states... arg. That first appointment was 90 minutes. The next two appointments were meeting with family members to make sure history was accurate.

So here are some good luck vibes coming your way. I hope you click with the new pdoc and I really hope they become someone that you can develop a good rapport with and that you can trust.
Don't be afraid. Realize they have heard it all and by being forthcoming, you will be getting the best care you can. And know that it takes time. Deep breaths!