In the start of june I was told I had mono by my doctor. He also gave me an ekg and then told me it had questionable spots. Then in mid-july I went to a cardiologist and had another ekg which was more "off" but still not very serious. But they still told me to get an exorcise test and blood work to see if my potassium was low. It turned out to be low so they gave me pills and I felt so much better. That week I got my exorcise test and yesterday both my cardioloy doctor and my primary doctor said I had nothing to worry about and that everthing looks fine. But I also had to get more potassium bloodwork done yesterday. Well, a nurse at my primary doctor's office said my potassium was normal but since I was still feeling weak, I have to get another ekg.

What's wrong with me? Am I fine (like they told me) or am I not?