I've been doing HR training for a few years, so when this occurred, knew immediately that something was wrong as apart from the physical symptoms (breathlessness, chestpain, thumping HR etc) my RHR was up by about 15 - 20bpm, my blood pressure was much higher than normal (higher even than when pregnant when I had pre-eclampsia) and when attempting to run, my HRs were off the scale. I ended up in A + E over Christmas (999 call) where I was told that it was cardiac-related and as I wasn't actually having a heart attack, I'd need to go back to my GP.
My GP disagreed, diagnosing it as asthma and ignoring my training history - surprisingly enough, the treatment didn't make me any better! Eventually, I managed to arrange to have a scan which showed the physical damage to the heart. The technician (female, similar age to me, 50's) was very helpful, thought that she knew what was going on, but to be sure, called in a cardiologist - again, female in her 50's . She agreed with the diagnosis and explained it to me. The cardiologist felt that had I been a male presenting with these symptoms, then I would have been taken more seriously and possibly admitted to hospital where I could have been treated more aggressively, so reducing the problem and the damage.
At that stage, they couldn't tell whether the damage was permanent, luckily it wasn't. However, it was a year before I was able to get back to running. There was no treatment other than rest, so I stopped everything and just sat around, resting - well, in as much as you can with two children. The one thing that they did comment on was that my heart was much more "fit" than that of a non-exerciser, but while a good thing, it had skewed the results.
It has left me oddly vulnerable (germwise) and in a way that I never was before. I'd never had any form of breathing difficulties or lung problems at all until I picked this up. I had just started running again in December 2011 and was preparing to start mara training in January when I picked up a bug from my nephew (possibly the one who gave me the virus that caused the myocarditis) - I've been off these last two months, diagnosed two weeks ago with pneumonia.
But, in the famous saying "I'll be back"!