Replying to Holy shit....so scared

last night i went out to smoke some pot and it was all going good. normaly when i get high its mad fun and chill. it started out like that but then all hel broke loose. i started feeling really weird and i thiught my tounge was swelling, i thought it was swelling so much that i couldnt breathe and i started to panic. for the next 3 hours i was terrified. my heart was racing and i thught i was going to die. noting i could do was helping.  the whole time i thought i was ODing and i wanted to tell my parents i was so they could help me. luckily i didnt and just endured it.


overall it was the worst experience of my life. does anybody know any ways to prevent this if it happens again or have similar stories to tell?