Can someone help me find out what I have? I have been to the doctors and a lot of my tests are abnormal but they cannot find the exact cause of my symptoms and test results. I am a 24 year old female. I have a pacemaker for 3 years now. Here is a list of my symptoms: chest pain on and off (same spot always, shortness of breath easily, rapid heart rate( now resolved most of the time due to my ablation of my heart), dizziness, weakness. My doctors so far have diagnosed me with postural orthostatic tachycardia syndrome. My oxygen drops only with minimal exercise from 100% to 80% in 5 minutes jogging on tread mill. The doctors have no clue why with exertion my heart rate goes to 160’s (after ablation) and oxygen down to 80% with minimal exercise. Please help me. I do not have faith in doctors anymore.

Can someone help me find out what I have? I have been to the doctors and a lot of my tests are abnormal but they cannot find the exact cause of my symptoms and test results. I am a 24 year old female. I have a pacemaker for 3 years now. Here is a list of my symptoms: chest pain on and off (same spot always, shortness of breath easily, rapid heart rate( now resolved most of the time due to my ablation of my heart), dizziness, weakness. My doctors so far have diagnosed me with postural orthostatic tachycardia syndrome. My oxygen drops only with minimal exercise from 100% to 80% in 5 minutes jogging on tread mill. The doctors have no clue why with exertion my heart rate goes to 160’s (after ablation) and oxygen down to 80% with minimal exercise. Please help me. I do not have faith in doctors anymore.