For real? Down to 1?
On the couple of occasions where my BGL has fallen towards 2, I've felt decidedly unwell.
I don't know enough about your situation to be an alarmist, but I'd definitely be looking to talk to the diabetes nurse at my local surgery in the first instance. I suspect that, given the time of year and shortage of cover, I'd be on to the local A&E to get someone to call me back tout suite.
So, glucose tablets constantly on hand to counteract the lows and ten minutes brisk movement (contraction and stretching of muscles soak up glucose without insulin) and plenty of water to tackle the highs, wait 15 mins, test - repeat as necessary.