You’re experiencing pain in the chest as if a rope was being tightened around it. So how do you perform CPR on yourself ?
Cough repeatedly and vigorously. A deep breath should be taken before each cough. This gets oxygen into your lungs. The cough must be deep and prolonged as if trying to produce sputum. This squeezes the heart and keeps blood circulating. Your life depends on it. This sequence must be repeated every two seconds without let-up until help arrives or the heart starts beating again.