I have mild, lingering HPPD-like symptoms that have remained long after I quit using E regularly.
The two main symptoms are that still pictures of clouds "move" when I look at them, mainly on a computer or tv screen. The movement is always from right to left, and even when I know they aren't moving they still "move".
The second is that now I sometimes awake very suddenly with a feeling that something or someone is in the bedroom. For a second or two after opening my eyes, in the dark I see superimposed images of a person or object, very life like and in three dimensions. This is accompanied by a very strange out of body feeling that is not unpleasant or pleasant. The images begin to fade almost immediately and in a second or two they are gone.
The sensation I have is not one of fear, but more of wonder. Once I saw a woman walking along the bed, and my first impression was that she was lost and needed help. I woke up my partner who was sleeping next to me, but by then she was gone. I don't believe in the supernatural, so there is some brain function thing that is causing these experiences.