Thanks everyone! I have a doctors appointment in a month and I'm going to ask about it. For now though I know my heart is healthy because they already did all the tests on it. My heart rate was 193 when it was highest on the TTT. I'm 15, and I have been walking a little for the past six months, but I think I'm deconditioned. My heart rate sitting or standing is 70-80 bpm now that I'm on Florinef. I'm still having GI issues, blood pooling, brain fog etc. While I was exercising I got too dizzy and I probably should have stopped. I was nauseous after, but they both went away after I sat down and hydrated when I got home.