Went to the docs this morning after being in denial over some symptoms, and ended up having an ECG which has been referred to a cardiologist. It seemed to suggest I have thickened heart muscle. Basically my symptoms started after running a really tough 15 mile cross country race. I felt fine all the way round, but sprinted for the finish. When I stopped I had a dull ache in my chest. I've had heartburn in the past and this is similar but not as sharp or painful. That was three weeks ago and I have had the ache ever since and am very aware of my heart beat. It's not palpitations as my heart isn't racing. The dull aches persists. I have done a couple of runs but don't feel right and have struggled a bit. Saying that I did run a 6 mile cross country race on Sunday as the ache had eased. I didn't push it, kept in a comfortable zone and wore my HR monitor. Now the ache is worse, hence the trip to the docs. Has anyone else had anything similar? I am waiting to hear what further test I might need and am a bit nervous to be honest. When you're told not to run I think I might keel over at any moment!