question: Hi, may I answer your health queries right now ?  Please type your query here... I ran a 10K race yesterday and half way through my heart beat was racing, and my legs went heavy, I turned very grey and pale in the face and when I finished the race my heart rate was very high. I am a very fit person who trains at the gym four times a week and cannot believe how I felt yesterday even though I had done the 10K before. I felt exhausted when I had finished. Thanks  Shona