Hi, Recently I Have Been Feeling Quite Stressed Because Of

Hi, recently I have been feeling quite stressed because of my exams and assignments. although I got most of the work over with and don't have much left to do, las tnight I couldn't sleep because my heart was pounding and somehow I got that really sore knotted stomach feeling. i kept waking up with the annoyance of my pounding heart. your advice would be really appreciated. :)