Hi. I was diagnosed with heart failure a few months ago. After an MRI on my heart I was informed two weeks ago that the mild heart failure had completely reversed. However, I am still on the lowest dose of beta blocker and another one that helps strengthen my heart. I was told that I can exercise strenuously (ie speedwork etc) but to build up slowly which i have been doing. My problem is that I still feel really rough. I went for a gentle 30 minute run yesterday which was fine, but I have woken up today with pain in my chest (in the centre and radiating out across both sides) and a feeling that I am not getting enough oxygen when I breathe. I have been training for about three weeks with this problem happening for the fourth time now. If i am 'better' why do I feel so rough?My diet is excellent, my knowledge of how to train is learnt from a Navy seal so its not that Im overdoing things.