Stress?

How do I know that pharmacy school has finally stressed me out a little too much? When my heart is racing and my mind alert even without the consumption of coffee. I believe a little stress is productive but that level has reached beyond the functional state today, for the first time since school started! In a way, I am glad that I am somehow normal like the rest of my class. I was starting to wonder what was wrong with me for being so calm and kicked back about exams and grades. In another way, I am disappointed at myself for not being able to control my anxiety, which signals that I still can't get over worrying about grades!