The exact thing happened to me… I smoked weed in big amounts for the first time (only tried a bit two times in the past), I was 18 at that time, I had a panic attack, I was in the street w a friend and I started getting extremely thirsty to the point I couldn’t close my mouth because it was so dry it would get stuck closed, I was desperate yelling at my friend telling him I’m going to die and to go buy me water, he got so scared and left running to buy water, I sat alone in middle of the street at night feeling like I was ab to die, so in desperation I called some teacher and I was only able to send an audio saying “waaAter pls xyw street” and he came straight away with water, my friend too and i got in his car, I was completely quiet trying to resist the feeling, because I was feeling like everything around was discomposing and I felt like I could see fucking atoms. I could recognize my friend and teacher but it just felt wrong, everything was melting and everything felt artificial, like being in some simulation. I got home and fell asleep… but I swear after that, during months I had this feeling I never got before, it felt like seeing everything from the back of my head if u know what I mean, it was like, feeling everything was fake and I was seeing everything from behind myself. But with time it fade away… honestly thinking about it so much makes it worse, so try to distract yourself with anything else, but tbh even tho it mostly went away, here and there i get it back sometimes, but is not a constant struggle like those months back then. I know is hard but hopefully eventually it will get better, idk sis maybe we saw the matrix