What is the scientific reason for this behaviour?

I am a student athlete majoring in Computer science and mathematics so you can say that I am very busy and my brain is always thinking, besides I love philosophy, Like I think about a deep philosophical topic at least once every day. Nevertheless, I began smoking marijuana occasionaly this year (Once every month or so !! ).
The short term effects (One two hours) are awesome, I feel really relaxed and I laugh a lot with my friends, However, It all starts when I wake up the next day, I feel everything is fake, and I suffer sever anxiety (SEVERE, Like I want to kill my self to stop it). Here is exactly what I feel, I wake up look at my phone, see it is 9:30 am for example, I keep looking at the clock hoping it will change, but it stays 9:30 forever in my mind, and the grows my fear then I throw my phone away and starts walking in my house. Now I begin to think about weird thinks, When are my room-mates coming back, I begin worrying about really weird stuff, I worry about things that doesn't bother my in a normal day, I worry about why some people are laughing in the street or sad, I worry about the details of every conversation and I GET REALLY IRRITATED WHEN SOMEONE TALKS NON-SENSE. Like when Some is saying that he can do 200 pushups, on a normal day, I will know he is joking, but after the next day (or week even) after weed, i WOULD QUESTION, how he can do this, why, when, WEEEEEEIRD SHIT.
I basically catch up on every word on a conversation and start analysing it, even if the conversation is completely trivial, I drive myself insance, and the best day when I go to sleep. but then the same thing happens over and over again, and I feel I will never be back normal again, and then I get back to normal after a week or so.

The problem is after a week I feeel fine, and I forget about all this and do smoke again, and the same shit happens. I heard that many people are prone to weed and can actually develop serious mental illnesses from smoking weed (schizophrenia and other diseases). Does my genes doesn't mix well with marijuana and why ?