Diagnosed With Epilepsy. Had Seizure Due To Altitude Sickness. Irregular Heart Beat. Could There Be A Problem With Heart Muscle?

I was diagnosed with epilepsy when I was nine years old. I am now 45. I have not been on medication for 7 years and in that time have had only one seizure related to altitude sickness . My income is too low to afford insurance and too high to qualify for assistance so I go without treatment. For about 5 days now I have experienced a rapid, irregular heartbeat . It is accompanied with mild discomfort, a strange feeling in my diaphragm area, and has affected my appetite and energy level. Could my heart muscle be having seizures? When I have warning signs, it has generally been my left arm jerking. This is new and frightening. Thank you for listening.