I do a bit, yes. Sometimes. It comes and goes. Breathing difficulties are not too bad but I get a "tight" chest sometimes which disappears after a short time (maybe an hour or so) and some mornings wake up with a bit of a chesty cough. That disappears too and there's no sign of it mostly! Heart palpitations, sure. My heart sometimes misses 4-5 beats a minute and it feels like going down in a fast lift. Other times it slows down and speeds up by 10-20 bpm all in one minute of monitoring pulse rate! That is just bizarre.
The doctor checked my heart -just listened to it with a stethoscope late last November and said it was fine, no worries.
So okay, I just trundle on then.
The IBS comes and goes when it feels like it too. I have periods of absolute total normality!