I get muscle and joint aches when my BG is high, and sometimes a headache (especially if I've eaten something very sugary like pancakes with syrup). Unlike everyone else is saying I usually get mellow and sleepy. I will sometimes have a small snack with no bolus before bed when I want to sleep well.
When I am low I get very paranoid and anxious. I get very hot, then sweaty, shakey and I'll get moody and snap at people. I don't often get low enough that I feel out of control anymore. I can usually gauge that I need to test and eat.
If I have juice for a low, that will give me a headache. I have to have a piece of fruit or some cookies or crackers or I rebound way too far.