Hi Apricot! From what I can see you're only on metformin - is that right? If so, you may need to look more carefully at your diet or talk to the doctor about a different medication regime. Your readfing of 21 was WAY too high, and your fasting BGs are too high as well. The "quiche" bit to me was a clue as to perhaps dietary issues. You preceded your description of "quiche with 6 tiny potatos" with "a light meal". But quiche is flour; bad. And even though they're small, 6 jerseys is quite a lot to go with it.
You need to get your BGs down quickly I'd say. May help to send us a description of a couple of typical days meals that we may be able to help with. But if you keep getting BGs like you have, you'll need to go back to the Docs I suggest.
It could be that feeling so bad was as a result of an infection and that raised your BGs so much, but that was an old post - has that side improved now?