I've had a similar experience. Smoking for my first time, it brought out my hidden panic disorder. The first few times I smoked, I felt as if I had died, and was dreaming, and that the others were just messing with me, and that they couldn't understand me, and I wanted it to stop. I was crying, and thought that I was dead, or must have died and "woke up" in a different world. Usually whenever I get extremely fucked up, I can still feel it the next day, but I find that usually, its our minds that play those tricks on us. Whenever I start to feel like I'm going to have a panic attack, I just calm myself down. If we start to get scared, and think of impossible scenerios of what could have happened, it will just get worse. After my first time smoking, it traumatized me, and everytime I was around the stuff, I feared that I would get a contact high, and the same thing would happen. It even got so bad that even just thinking about cannabis would make me feel "high" again, but it's just our panic that brings that stuff out. I'm on Paxil now, so it helps me control my panic attacks, like when I smoke weed, I'm still getting used to being high, so right when it kicks in, my heart beats fast, and I get to the point where my mind could think of bizzarre things, and then I'll cry and freak out, but instead I just try to slow my breathing, and chill out, like watch a movie or something. Just realize that other people have had this feeling, and it's a negative effect that THC can have on people. Alot of people get paranoid and shit, and I know that you think this is totally different and I'm sure some people here will reply with answers that don't help you, but I've been through very similar experiences, afraid that I died, that it was all a dream, that the high would never end, and what made it WORSE, is the next day, when I was still so traumatised that my mind convinced myself that I was still high, even when I wasn't. It's a mild form of Post-Traumatic-Stress-Disorder. Very similar to when soldiers have a terrible time at war, and come back, and whenever they hear a loud noise, they think/fear that they are back on the battle zone.
I hope everything goes better for you. It took me a year after my first experience to actually calm down, and to make the panic attacks stop. Now I can smoke and calm myself down... so, I hope that things are okay for you.
Peace,
horror business