Hi Jammer,
I have this all the time. One day I'll be loving my job, on top of the world, and the next day the slightest comment from my manager will set me off and I'll be hating it for a couple of days. And the mood doesn't just affect me at work. I'll be grumpy at home, hating everything, on the verge of tears sometimes... one time I did just go to the toilets at work and cry; and for a big, butch man, that really does send a message home.
When I brought this up with my consultant he suggested chemical imbalance and anti-depressant tablets, at which point I decided I wasn't depressed and that I just needed to sort out the various issues affecting me in my every day life.
That said, I KNOW my moods swing more frequently and more viciously than before I was diagnosed. And although certain things sort themselves out and others take more imput from me, I definitely feel more suceptable to bouts of feeling down.
Unfortunately, other than happy pills, it's up to the individual to do something about it. You need to recognise when it's happening, work out if it's genuine unhappiness, or just a passing mood, and react accordingly. Sometimes I think it's healthy to have a grump, stomp around for a bit and come out the other side. Other times you need to give yourself a kick up the backside and snap out of it.
My opinion? Simply the joys of being human!... exagerated by diabetes.
Sam.