WHAT'S WRONG WITH MY HEART?

This troubled me for quite a while now, I noticed that I feel tired easily, and my heart would suddenly pumped so hard I can barely breathe. This must be stress I said to myself. I can't deal with the endless pressures right now. Final exams, INC's, Thesis, Graduation. I feel like I'm going to explode. It's draining my energy. I need to rest. I am tired.