as a freelancer and wfh guy since over 20 years, and now with stomach ulcer, heart condition and almost 50yo, went thru this once a while. what i do easy. find a day off. go out. try not to fall asleep. eat good food. come home later. nice cold shower. rest a bit. go to sleep as soon as feel tired. forget about everything else. stressed mind will effect your sleep. make sure drink lotsa water. eat on time. junk food is ok. but avoid spicy, oily ones. coffee is ok too but not too much. also do some physical exercise as often as you can. trust me it helps. will take awhile for you to be better. also go see a doctor.

not sure yet. still on follow up with hosp. from personal experiences, if go to clinic, doctors tend to say nothing wrong, dun worry, blablabla. very frustrating. then all the sudden you got heart attack, those doctors will just let hands go.