I have never had to bring up my condition when getting diagnosed. I guess I'm a real obvious case. lol
However, I saw a suggestion to bring your ideas to the doctor in writing, or even to email them, if that's a possibility. You can go to the appointment with a print out and say, I saw this, it's hard to talk about but I can really relate to this, and I think it should be explored further.
The first thing the doctor will do is assume you are depressed and prescribe a medication.

They're doctors - that's what they are trained to do! Try the pills - why not - they might help. But also ask for a referral for a psych eval.
That's the easiest way to talk about it without talking about it.