Hi PSS,
I am also a T2 and since I have started to lower my BS's and take control - I have started to get a kind of tension like headache, which makes me feel a little unwell, in that I get a bit shaky and anxious - sometimes I start to feel warm. Usually though when I test my sugars I find they are perfectly normal by this I mean they are never below 4.0. If I keep my BS under control eventually these episodes of feeling like this go... but if I am bad foodwise - they return until I get things under control.
I hope this helps.