Hi silicontrip, welcome to the forums.
I'm so sorry that you're dealing with this, it's an issue that shouldn't happen with anyone. Funnily enough though, I'm in the same position as you, hence me coming onto your thread, to seek advice myself and try to offer you support from me, so I hope that's alright. I'll read through everybody else's comments here aswell.
What I would suggest is picking whoever you trust and feel more comfortable with, and who you think has more knowledge of the meds - dosages, side effects, etc. to prescribe it for you.
As for getting a new GP, I personally think yes, it could be a good idea, but it also may not, because some GPs will think that some people are just going to Doctors to get prescriptions for the sake of it (I'm experiencing that now with my GP, which of course isn't the case at all), so if you were to see a new GP, I'd see one that someone you know is seeing so you can say "I know (name), I was wondering if you'd please prescribe (med name)" etc. That's just my opinion and suggestion though, I'm sorry I can't be of much help because I'm dealing with the exact same thing you are.
For me personally I trust my Psychiatrist more and would rather him prescribe me things. The reason why is because from the first time I saw him, I trusted him and I felt comfortable and that's hard for me with therapists since I've had so many bad experiences unfortunately, he's the only good health professional I've ever had, and I'm thankful. I don't feel comfortable or trust my GP at all, because she has no knowledge of anything, not even that my Psychiatrist gives me therapy, how Medicare works including paying for me to see my Psychiatrist, what meds I'm taking, etc. (I explained all of this to her).
Whereas my Psychiatrist tells me what meds I can try, the dosages (one to take at the time and then if I tolerate them, make the dosage higher), the side effects (although it's different for everybody, some may get all side effects, some may not get any or only a few), how they work and what they're for, and just general knowledge of it, he always asks me how I'm feeling and if they've helped too. My GP doesn't care at all.
So hence me saying I'd choose who you feel most comfortable with and who you think has more knowledge of the drug to prescribe it to you.
Either that or you could ask your local Pharmacist about the drug, and who you think may be better prescribing it and explain the situation to get their thoughts?