Did you had you're first DP moment combined with an anxiety attack? cause that's what happened to me I and certanly don't have HPPD. I know a person myself with this disorder and its far different of what I'm suffering of. He realy can't stare at objects longer than 3 seconds before they melt away right in front of him. HPPD is a far more vision related disorder then DP is. after all dp is still an anxiety product, HPPD is not anxiety related at all