86 beats per minute heart rate, yet I breathe like I ran and my heart beat is loud. My body is shaking, I have dry cough and blocked nose with mucus.

Hard breathing. Blockage of nasal passages with harder breathing can make the heart work harder which means more forceful beat and faster heart rate with exertion. Are your nasal passages blocked because of allergies or because of infection? You may need a course of antibiotics if you have a sinus infection.