HELP….I FEAR I MAY NEED A NEW DOC!!!

I just finished my second month in Letrozole, and so far no luck! I didn’t know to much about it until I started doing my own research and joining in on Glow groups. Now my doc prescribed me 2.5mg without being monitored at all, and my AF only lasts 3 days so when I start my prescription I’m already on my last day of AF….is this normal? I’ve tried getting in to see my doc and have yet to be seen. He didn’t even have me come in ti prescribe this to me…just messaged me through my portal saying it would be prescribed with directions! I have called other docs and the waitlist is ridiculous but I’m on it…idk whether to keep taking it, or to stop altogether, or take it CD 1-5…any advice would be appreciated.