Hello Summer,
First, is there any chance of changing your GP? I wouldn't think a doctor should ever think someone with a history of molar pregnancies or miscarriage was hysterical. At the very least, a GP should be supportive and offer advice on how you should proceed. Do you think your GP is supportive? (Even if they can't help themselves for whatever reason.)
Also, when you say the miscarriage clinic, is that the same as the fertility unit at your local hospital? Or something different? (My GP referred me to the fertility unit at the hospital near where I live.)
I don't know too much about molar pregnancies, apologies, but I understand that you have to avoid getting pregnant until a hospital signs you off? Has this just occurred for you? My friend had one and it was seen as dangerous for her to try and conceive again until the hospital had given her the all-clear, so I imagine this also causes a delay.
Sorry for more questions - just trying to understand your situation better.