Hello and thanks for sharing. I have a similar story. HPPD for a little over a year now from LSD and mushrooms.
Interesting how you say you feel like your life is slipping away. I can relate. Things will never go back to the way they were. The enjoyment of simple pleasures, the relaxed anxiety free moments just hanging out with friends. Or just watching a movie and forgetting your surroundings.
Well, even though this might not coming back the same way, I'm hoping that life can be good in other ways. Things I used to enjoy I am no longer enjoying, like taking drugs, partying, hanging out, smoking cigarettes. Now I am starting to enjoy stuff I didn't before, healthy stuff like working out, eating healthy and being in nature. Perhaps life is not as pleasurable as before, but in some ways there is a lot more life in me now.
Wish you the best in your recovery.