HPPD is worse for about the first 6 months, then it gradually fades to a stable level. You might not need any medication eventually. It's a bit of a learning curve figuring out what makes you worse and what doesn't - there are very few things that will "permanently" make you worse. Most things are a few hours (coffee or a hangover) to months (weed for me).
My advice would be before you start a medication, scour these forums to see what the general consensus is - it's usually right.
When you can avoid your triggers, you can start to put together a normal life and heal. The more you focus on the HPPD (for example by visiting this forum), the worse your symptoms appear.
Please keep going! I'd recommend valdoxan if you need an anti-depressant that won't mess you up. I've been on it for 5 months and it's not affected my symptoms, and worked very well.