What you should do for survival incase of heart attack when you are all alone & without medicine or assistace?

Heart attack. First you need good luck! you may try to give a series of sharp, hard coughs. Theoretically, this increases blood pressure to the coronary arteries temporarily, and may aid in dislodging a flow obstructing blood clot. I will finish with may usual advice: prevent so you don't need to fix!
911 open door aspiri. Call 911 open and lie down near it and take an Aspirin and call a neighbor , friend or relative.