I don't think you should write a letter because it could seem pushy. I know you want a diagnosis but my advice would be to be patient. If you start talking about symptoms that are similar to bipolar ones then your psych should acknowledge this but if he is any good at his job he will assess you mood more closely over a few months before diagnosing.
The bit I quoted is what think you should say he will then ask the questions he needs to. Start with that and see how it goes.
Gook luck
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