I am 29 years old, and my heart rate is 127 beats per minute. I am fatigued, with very low energy, tremors, and a shortness of breath. All of these symptoms are also recently accompanied by intense night sweats and migraines. I had an episode where my vision totally went out not too long ago. I had an eye exam, as well as a CT scan, done about a week ago, and the results appeared to be fairly normal. Can someone please tell me what may be going on??