Thank you for posting. First off, I'm not a doctor or an expert in hppd. I'm just an older person who has had it for a long time.
A lot of people have panic attacks from smoking weed. The weed that's available today is SO powerful. It's no surprise that you experienced anxiety from it. I know people who have smoked for decades who won't touch what's available today. Fortunately, you've decided to give MJ a rest. The symptoms may simply be indicators that you're susceptible to hppd. I honestly can't tell for sure. Many of the visual anomolies you describe could be caused by eye fatigue or common eye abnormalities. Us humans don't always perceive "reality" just exactly perfect.
Old people like to tell stories, let me describe what I deal with. If I stare at anything, floors, ceilings, trees, clouds, within a few seconds they start transforming into patterns, animal, Aztec glyphs, etc. If I keep staring they start to move and sometimes the colors start to shift. I've had this disorder for almost 40 years. HPPD for sure. People in here describe derealiazation and anxiety that is truly debilitating. Some describe hppd as being on a low dose of acid all the time. Is this the kind of thing you're experiencing?
As I said, I can't tell if you have hppd, early hppd symptoms, or if you don't have it at all. My gut feeling is that you don't have hppd. Please understand I'm not trying to minimize what you're dealing with. Anxiety is no joke but, unfortunately, it is part of the human experience in a world that can't seem to rest.
This is what I would suggest. Continue to stay clear of psychoactive drugs like MJ, acid, etc. Focus on the things that interest you and that give you joy. Why do I say this? When I'm focused I don't have hallucinations. Staying focused and reaching for goals in life is what saved this psychedelic wreck.
Even if you have some early hppd symptoms, and you stay clean, I'll bet life will work out fine and those symptoms will improve. Myself, and others with severe symptoms have careers, raise families, and have found great joy in life.
Hang in there and take care of yourself.
I hope that helps.