How to handle my anxiety?!?!?

Hey so I got high for my first time last night. And i had a reallllly bad trip. I started thinking that im gonna die. and my heart started beating really fast and my head felt REALY weird. it felt like i was talking outside of my body. like i was in the third person. My body just felt like it wasnt mine and i was just barely keeping control. I have had troubles with anxiety for the past couple years. Also i felt like i fell into this state of feeling that i cant get out of. it just feels like im not myself. I was scared that if i fell asleep i would die or go into a coma. I woke up this morning feeling better and more of myself. except sometimes i feel like im not my self again and start thinking of all these scary thought that i will stay like this forever. please help i dont know what to do. im 15 and male