Cannabis Addiction :: Derealization, Slow Heart Rate And Panic Attacks

So basically it all started a few months ago back when i had a terrible panic attack on weed. I smoked a blunt with a friend, i don't know whether the weed was laced or anything, but my friend seemed perfectly alright so i don't think it had anything in it. I thought i was going to die, my heart beat really fast, i felt sick and i thought i was going to be insane for the rest of my life. The next day after the panic attack i felt slightly weird and a bit paranoid when i woke up in the morning. I then went to work as usual and i realized that something was a bit off. I didn't know back than that it was probably derealization. Anyway two days after my experience everything was fine and i didn't waste to many thoughts on my experience. Until about two and a half months later...

It was pretty much a stressful time period in my life and i worked quite a bit. I didn't touch anything after that experience, but one day after work and a work out at the gym i had a bad panic attack which was sort of like a flashback to my experience as well. It hit me when i was walking in a park at nighttime and i felt very bad for an hour. Eventually it wore off and I went to sleep that night. The next day i was thinking about what i had experienced the last night, but i thought i might have been just really tired or didn't eat enough. The next days i had small attacks which were bad, but didn't concern me too much, but little did i know that i was getting a flu. During my flu which lasted a week the derealization hit me again. All the lights were really bright and i felt in a dream like state. Those feelings eventually passed with the flew after about 2 weeks. 

A few weeks back from now i had another big panic attack which also felt a bit like my first panic attack on weed, so i guess it was sorta like a flashback. At that point i didn't know what was happening to me. Why was i always getting these attacks?? Did the weed trigger something or am i psychotic now?? I was really afraid to go insane and lose my mind. I was researching about schizophrenia and how panic attacks/derealization are a common symptom of it. I felt constantly like i was drunk/high, i had long after images, objects were breathing when i looked at them, lights were always too bright, everything felt unreal like in a video game. This made me feel really anxious all the time and i think this got me deeper into the derealization. The panic attacks have passed, but until now which has been probably about 2 months with more or less derealization i don't know what to do. I don't know how it got triggered, whether i do have a ptsd from my weed panic attack which i have to think of very often these days as i see it as the point where everything started. I am constantly worrying about losing my mind and don't know what to do. Do you think i might have a psychosis or is it more a ptsd or a anxiety disorder? Please let me have your thoughts.