Of course it can get worse.... way, way worse.
My LSD induced hppd was manageable and probably like you have now, quite strong visuals, but not major mental issues... but once I started taking mdma, i sunk into a hellish state that has lasted 20+ years now. You are now treading a very, very fine line where even a bad hangover might push you over the edge, let alone LSD or other drugs.
I'm sure there are no words that can really put across how bad it can become... that might turn you away from drugs... All i'll say is that I would rather be blind, I would rather have terminal cancer, I would rather have both my arms cut off than have my current level of hppd. Is that risk worth it?