Alot of people fully recover from HPPD, so it is curable.
Quit drugs, alcohol, eat healthy, excerise and try to fill your day with things that you enjoy and can take your mind off the hppd. Try and do some sports (become the next antonio valencia!), go for walks in nature. Try and take the stress out of your life.
Also, remember that there are alot of people on here that have hppd but also a great life... married, good jobs, education etc . Even if you don't get cured, you can live a great life.
Good luck, Jay