I know exactly which doctor you were trying to see. I also got a letter in the mail last week saying I'd need to reschedule my appointment from the middle of February, but I haven't called them yet to do so. Keep the appointment and get on their waiting list, you will get in earlier I'm sure, I did.
In the meantime, if you feel that HRT is where you want/need to end up, then go ahead and get started by visiting Planned Parenthood. That's what I did, and two month later, the Endo called me to say they'd had a slot open up, at which point the Endo just upped my dosages after some bloodwork, then I stopped going to PP.
Stay the course. It's a long road ahead, but it will happen, you just have to make the appointments. Feel free to message me if you want to talk more specifically about my experiences with that exact doctor and PP office.