I don't know. What is going on with me.

I got high last night after that I was just normally watching reels and then I saw a scary reel and a sudden jumpscare came after that I was feeling uneasy and shivering feeling like I'm having a heart attack after that I went to hospital they gave me some medicine and was feeling little better, after that my shivering got away but still feeling like I'm having a stroke or something. Doctor told me that it was anxiety and suggested me to take good sleep. After returning home from the hospital I was trying to sleep even feeling sleepy too but idk my mind can't stop overthinking due to which I'm not able to sleep and still feeling like my heartbeat is high or something. Kindly tell what is going on with me.