I’d consider the beta blockers as the culprit, given your timings of things…
I take it warfarin is for AF/irregular heart beat? You’ll prob read on the internet about “embolic clots” causing blue, cold limbs. This is usually just one limb/finger, that acutely happens, and doesn’t get better.
With the colour change, Raynaud’s phenomenon sounds likely, in which case I’d have a chat with your GP to perhaps try a different drug to the Beta blocker, and maybe add another drug to ‘open’ the blood vessels. In the mean time, warmer gloves……..
BTW Ton – I never thanked you for recommending the skinny cross tyres for all this snow (michelin ones), I got them, and can now travel on snow again!
DrP