Why are these shroom flashbacks happening?Help!!?

I took 26 grams of these really strong shrooms for my first time, and had a really bad terrifying trip. Now, 5 days later, this is the second time weird **** has happened to me. I was in school, and then i started to get shaky, and all of the sudden it was like i was tripping again. The whole room was maelting and morphing and i was seeing colors...then, i was back in my first trip..same place..same everything. Nobody in my family has had a mental disorder or anything so i know i don't have one. I heard its either that the trip is imprinted in your memory or becuase there are still shrooms in your body that cause it..please help me why is this happening and how can i stop it??