In the mind

I went to see my Cardiologist today. It was a strange appointment. I was sure there was something going wrong with my heart, I've lain awake at night listening to it, hour after hour, sure it was going wrong, sure my appointment would flag up something previously unseen, something potentially fatal. I knew I was broken and I knew it was all going to come out when he gave me the ECG scan (my first for several months). I was ready for the worst.
"Hmmm... another boring ECG scan. They were much more interesting when I saw you back in March. Now everything is just normal. Well I won't need to see you 6 months so I'll see you in February."
So what now... my heart is not broken. Does my mind remain broken from the thyroid, or has the whole near death experience left me paranoid and is this normal. I guess I don't know. But at least I know I'm wrong which I guess is good.