How could recognise which doctor I will.

I have been in confusion from a long time now and want to discuss an issue. Three months ago I faced heart issue and underwent angiogram. The reports said there were no blockage in my heart but after that phase I have been facing a some of problems in me. Due to too much tension and pressure  face palpitations in my heart and can't sleep at night.Also I feel a pressure in my heart on the left side of it with a vomiting tendency.I take rose day 5mg for  cholesterol and librotrip DS for disturbed sleep. It has been last 3 month time since I have been facing this problems.I need a help as I am confused in choosing which type of doctor I should visit. It would be very grateful if I get some good suggestions.