I am a type 1 diabetic and have been for 31 years. I have mood changes due to my sugars dropping, I tend to get short tempered and defiant. I don't really have changes to high sugars but it does make me feel tired and listless.
I hope this helps
I'm type 2 diabetic and if my blood sugar gets low can get rather 'narky'. A couple of times a colleague at work had told me to go and eat something as I was being bad tempered which is not like me! (Her sister is type1 so knows the signs)