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Do you think you might have HPPD?
Take this survey out of University of East London,
which attempts to understand the inner experiences of
people with lasting perceptual changes from use of
psychoactive drugs, (diagnosed or not). It investigates
factors that could create distress or effect quality of life.
Neurology

1998

Memory impairment in abstinent MDMA ('Ecstasy') users, by Karen I. Bolla, PhD; Una D. McCann, MD; George A. Ricaurte, MD, PhD
Neurology Vol 51, Dec 1998, 1532-1537
(Online Copy)(Hardcopy)