Palpitations. Two days of my cycle.

Hello respected Doctors, I don't know whether this is the right department to approach for the problem I am facing. Kindly help. I am 35 yrs old unmarried virgin female. I keep getting severe palpitations and left side chest pain only during first two days of my menstrual cycle every month. After that it goes away. No other symptoms. The bleeding is normal with light lower abdominal pain.I have done all different sorts of tests.. Ecg, echo, ultrasonography of lower upper abd.. All blood tests. Kft, lft, serum tests. I don't have high bp or thyroid problem. I am non diabetic too. Follicular tests done too.. Nothing done. Gynaecologists are saying it's heart and cardiologists are saying it's nothing related to heart. I am getting scared. Pls help.. I am tired of visiting different Doctors. I don't want to die.. But the palpitations kills me on the first two days of my cycle.. Regards.