Question about marijuana and bugging out?

I smoked with two of my friends and had a horrible experience. All of a sudden my heart would start racing and I would go into a strange state of mind. I was terrified and felt like I didn't hav the energy to talk. It was not laced because nothing happened to my friends. At one point it wasnt like I was hallucinating but I would start thinking about it and I would feel a wet spot in the back of my throat and thought it was blood .. Idk y. At another time I felt like I had no eye. I got so depressed that i left and went home and once i did i was real comfortable and relaxed. This has happened before but never with the hallucination type effects. It was mad wierd what could have happened. Once agAin it was not laced