From everywhere I've read, SSRI's usually make hppd worse )): Klonopin seems to help some. People with hppd usually try to avoid SSRI's as a treatment for HPPD/depression/anxiety.
As much as the general public would have you believe, doctors don't know everything. YOU are your best advocate, period! If your doctor is ignoring your symptoms/thoughts/feelings, especially concerning a medication, that's a red flag for sure. Doctors should always have your care in mind, and unfortunately some do not listen. Not saying that is the case, but even before I had hppd I had a doctor like this. My best advice is do your own research, and advocate for yourself. If your doctor doesn't listen to you about what's not working for you, perhaps it's time to look for another one if you're able.
Unfortunatlely, doctors don't usually know much about HPPD. There is no exact pathway for a cure medication wise. Ultimately, do your own research and just know it will take time to find what works for you.
Try not beat yourself up about how your HPPD came on. Try to focus more on reducing anxiety and focusing on recovery ((: It'll be much better to look forward rather than to be upset about the past, especially something that cannot be changed. Good luck!