Why is my heart so nervous)???!!!

Im not nervous at all … its just beating fast… i do havr anxiety but this isn’t anxiety… it feels like a streessed out nervousness heart … i cant control ..i think cuz im overweight and cant even run… i need to exercise thats why im feeling this way.. plus i have ofher thinfs wrong with me like Low blood pressure, hyperthyroidism… and A autoimmune disesse called CRESTT. Kinda like lupus but in the beginnings… do i need anxiety meds to help calm down my heart? 😥 also when it happens i dont wanna eat i wanna throw up…