Metformin Blues?

I have been having a horrible day. It started well with the lowest fasting BS (5.5) I've had since diagnosis, and then developed into a thumping headache. I feel so nauseous that I don't want to eat. I have had 3 (slightly) low BS's - the most I've had in a single day up to this point.

I can't possibly eat a proper meal so I skipped supper and am nibbling on a little bit of dark Lindt chocolate.

I'm not sure if it's the metformin starting to kick in, or if something else is at play.

I'm going metformin-less tomorrow and hoping that I feel better.