What are your experiences with marijuana withdrawal?

I’ve been smoking 13 months straight all day everyday. Weed from my friends is available all the time! so i’ve been sucked into the smoking world and i have loved it up until recently. i’ve been experiencing panic attacks where i think i’m going to go insane. i entertain such strange thoughts like i am everybody with no self, and my mind just seems jumbled and everything frightens me no matter what i think. i’ll be in class in college and something in the present moment will remind me of my past and it will even be a good memory but it will frighten me. almost as if im not frightened from the context of my thoughts but that i am aware that im thinking. its the strangest thing. like im a human that can’t live because he’s to focused on the functions of his mind rather then the experience they are giving him. anyone experience this stuff?