You don't sound "dumb" at all. You have a real concern and you're seeking information. I wish I had done that when I first had symptoms. Unfortunately, at that time, there was no Internet.
MJ is really powerful these days. I have a few friends who have never dosed who claim weed produces visual and auditory hallucinations. You may be experiencing the same thing. You dosed recently and the brain can hang onto those "memories" for a while. Consuming weed might be triggering what was "learned" during those experiences.
My advice would be to stay away from hallucinogenic substances including weed at least for a while. It can't hurt, right? I'm no expert on hppd and I'm not a medical professional. That being said, if you do have early hppd symptoms, you don't want to ignore them. In my opinion (an uneducated one) it doesn't sound like you have hppd but don't take chances by continuing to use hallucinogens. Hppd can be debilitating condition so give yourself a break to see where you stand.
Regarding your prescription, I'm not suggesting you discontinue medication prescribed by a doctor.
I hope that helps. Take care of yourself.