My friend dropped acid 3 days ago around noon with 3 other friends. They first took a single tab and later took another once they thought they were comfortable, and I arrived a couple hours later as their trip sitter to watch the trip play itself out and make sure no one would grt hurt. Everything seemed to be going fine and my friends started to gain their sanity back at around nighttime.... Except one of them. He couldnt get it out of his head that he was connected with the others and he could talk to them through feelings. He seemed deeply introspective and nervous, becoming seemingly agitated that he couldnt seem to connect any longer. I thought everything would be fine after they slept it off. Three days later he still seems to have extremely short term memory, confusion of the identity of individuals(will call his one friend the name of another), inability to converse on a topic because he cannot seem to focus, calling himself his name(instead my referring to himself as my, me, or I). Just earlier today he walked miles to the place of the trip because that was supposedly his happy place... and he thought he was with one of his friends even though he was alone. I am extremely worried that his condition will be permanent.... What is going on??