When I moved and changed doctors I asked the receptionist for an appointment with a GP with mental health experience.
Other than that I would say it's a case of building up and time. Try and focus on the more immediate things that they may need to know in regards to your therapy, medication and the support you need from them. It doesn't have to be all laid bare on the table from the start, that sounds (to me anyway) far too overwhelming for something that is stressful enough. Maybe make a list of the main issues (I don't want that word but I fail at finding another one) that you feel your doctor should be aware of and then work from there.
Take care
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