unfortunate son

Hi guys, so about 3 weeks ago i took a pot brownie. i felt a massive panic attack and since then i have been having persistent visuals (objects moving/expanding, patterns flowing and text moving from left to right). i may have slightly improved since the beginning but it is hard to tell. My symptoms get a lot worse in the evening and at night when things get darker. i have visited the doctor and he believes i just need to detox and should be fine in a couple of weeks, but i'm still concerned. i have taken mushrooms before so that could explain why i was sensitive to the weed in a psychedelic way. this was the first time i've had a brownie and there was about 0.5 g of hash inside. do i have hppd or am i still intoxicated?