I do exactly the same, about everything bead.  I know how you feel.  In fact i have just had a tiny little glass of Baileys and i am now beginning to worry about having it!  I used to be able to down the stuff without it affecting me at all, now i only have to sniff it to make me more dizzy, lol.
But i also know how you feel about doing something strenuous too.  I was putting stuff away in the caravan earlier and i didn't notice my heart beat at all, just the odd ectopic, then when i came in the house i was all sweaty and hot and i had a pain in my arm, and started to worry.  But my bp was fine and my heart was ok, i suppose.  Sometimes i can just stand up and my heart can be doing 120, and i'm not doing anything and i can feel it all over my body and in my ears, bashing away.  Then i can be rushing around, not as likely now a days however, and i don't even notice it, but if i check it, it really is bashing away like a good un.  If we don't notice it we are fine, but because of how we are, we DO notice it, which is the problem really.  Like i have said before, if my heart was going 120 or if i was having lots of ectopics in the day and night and i COULDN'T feel them, then i wouldn't care at all.  But they worry me because i can feel them so much, and i just can't let go worse luck.  I hope you are ok and will speak to you soon.xx

thanks for the replies.
I had a good weekend with my mum volunteering to look after my two boys. Managed to go out for a meal for the first time in about two years on our own. Which was quite enjoyable despite me worrying about it beforehand. I actually remember sitting htere looking out the window thinking well, this was nothing to worry about. But as soon as I left the restaurant my heart immediately started racing - well over 100 for about 20 mins.
I just can't work it out.
bead