Hello, I Have Been Suffering From Heart Palpitations For 6

Hello, I have been suffering from heart palpitations for 6 months now. Sometimes they are just a brief hiccup, other times my heart rate will go from 80-180. Fluttering and pounding in my chest. Had an EKG done, that said my heart and lungs are healthy. They gave me a low dosage beta-blocker to help regulate my heart rate. I get headaches about 3x a week, and have been have muscle spasms all over my body, even my face, but specifically in my abdominal. Sometimes my stomach will spasm really hard, almost as if I were shivering. I keep worrying that something is being overlooked.