thanks all for your helpful comments - but no, I'm on Metformin, 2x500mg a day. That's why the 2.2 was so weird (unless my meter was somehow malfunctioning). It hasn't happened since - in fact I have the opposite problem, my morning fasting numbers are a bit high (6.7, 7.2 etc) but numbers in the evening seem pretty good (5.3 before meal, 6.7 an hour after, 5.8 two hours after). Hmm. Anyway, I wish my doctor had advised me to use a meter when I was diagnosed last summer - it's incredibly helpful and actually quite reassuring (most of the time)!