Chest pain. I do in such situation?

Hey, So my problem is chest pain on left side, which comes and goes within minutes sometime. But yesterday night I had a discomfort in my chest but I slept well but as soon I woke up I feel it's really terrible. I could feel the pain with hand movements so I run to emergency room immediately. There doctors measure my bp 140/85. They do ecg which was completely normal. Then they do an ABC test shows that I have low blood oxygen level 77.8 (at that particular time) and then they do a trop I test which shows results lesser than 0.01. As I had anxiety issues from years they told me to consult psychiatrist and suggested me to add petril beta 0.25 clonazepame as sos pill. But still I am feeling so scared of all what happened I am so anxious. Additional - I had cough and cold last night and maybe a bit fever too (I didn't measure but felt) What should I do in such situation?