Thank you all for your kind words.
I have spoken to GP this morning and he thinks that, as long as the planned echocardiogram is normal and there are no structural heart defects, then no anti-coag is probably the right decision, as I have no other risk factors and this is a first episode. If it happens again, then there might need to be a rethink. I trust my GP and feel happier about things now. I have another ECG tomorrow, so will see what that brings. I have no reason to think this might not be normal, a things feel relatively stable at the moment, although when I try and lie down at all it does go a bit haywire.
Phew - I feel totally done for at the moment - it is one thing after another.
Good wishes to all of you who have similar problems or are dealing with OH with same.