I rememebr when i did ketamine, i remember doing to much and then feeling out of the world.. like I had DR/DP when tripping, it was a long time ago i cant recall anything other then just being disconnected from the world.
Even the other member said it bring DR/DP to you.
Just stop doing drugs, you already suffer from HPPD, if you keep on doing drugs, your hppd will only get worse.
Ask anyone they will promise you that more drugs will cause your HPPD to become hell.
Stay away from drugs