When I Wake Up From A Long Sleep My Heart

When I wake up from a long sleep my heart increases why? Plus I always have a diarrhea after I eat my meal. I pass stool three times a day. But my main issue is my heart rate whenever I try to exercise it beats too hard but not too fast. Sometimes I have a resting heart rate of 106 or above upto 120. I take 25 mg metoprolol and it works. But I want a complete solution please help me.