Hi all. This is my first post because I am concerned with changes in my vision over the last few weeks. A little over a month ago, I took a single tab of what I believe was lsd. Small, tasteless tab, I held it in my mouth for about half an hour. I tripped for about 8 hours. Smoked weed a few times throughout. I had pretty intense visuals at the peaks of my trip. Overall a nice trip, with a couple moments where I did experience fear. I came down and felt normal after comedown. I was smoking daily, and continued to until a week after the trip, I took a dab and was thrust back in to the acid headspace. I had mild visuals, fractal patterns and some changing colors. Not too intense, but since then I have felt strong anxiety, and in the pst week I have noticed changes in my vision, leading me to worry about hppd. The days following the weed induced flashback I felt very depersonalized, very anxious and it seemed to be less each day. But in the past week I have started to notice changes in my vision. Starting with intense after images, I first noticed watching tv I would get an after image of my tv that lasted longer than I had ever remembered. At work I looked at the parked cars on a sunny day and I closed my eyes, the after image of the white cars and parking lines I could see in vivid detail for about 5 or ten seconds, later I noticed halos around lights, starting with the lights in my house, and then street lights and head lights. I get rather mild tracers off of lights at night, they last a few seconds. During the day they last maybe a half a second. I haven't been sleeping well. When I go to bed I have intense phosphane images and occasionally fractal patterns. Flashes of light. Since the weed induced trip I have been clean from all drugs accept an e cig, I stopped drinking coffee, I'm worried that my symptoms are getting worse. Should I be worried? This was my first and only acid trip, I don't have much to compare it to but it was very intense. Am I developing hppd? I'm not sleeping well because of all this, I am dreaming vividly, likely because of the removal of weed. When I sleep I only dream. I wake up multiple times per night in between dreams. I've had sleep pralisis and acid trip dreams. I'm worried that this is gonna effect my life.