Thanks to all for your good wishes. I am now home on light duties for a week or so and can drive again from Monday. As Eileen so kindly mentioned it wasn't AF but was heart related although since extremely rare and unusual ( I gave the doctors a bit of an "Oh Shit" moment) not for the faint hearted so I will not explain further. All tests come up clear so just time to heal now.
Once again thanks for all your good wishes and I will be taking more time here again soon.