I m a 62 year old heart patient, I walked today after not feeling so good. Don t know why I pushed myself, but I did. I have absolutely no chest pains, nor did I during uphill walk. Now its been at least 3 hrs. after my uphill walk, and I still feel nauseous--like I could due for a round of Zofran. Have taken an extra round of potassium & Magnesium, as I m on a double dose of Furosemide, today. I think I m over-diuresed. Lost lots of water by perspiration during walk. Too tired to think of calling my doctor, however, I m starting to feel a little bit better then before. My question is, if I m feeling a very little bit better, should I do this pill of Zofran to assure the nauseous feeling is gone.