I am bipolar, so I have mood swings. Long periods of little symptoms, then some spots where it misbehaves.
I had a mania recently which was not made any better by my blood sugars being in the 20's and 30's and I was in hospital to be put on insulin for what turned out to be a slow onsetting type 1, not the type 2 they had thought.
For me, avoiding spikes in blood sugar and spending most of my time in ketosis (like you do on a low carb diet) seems to stabilise my moods.
I definately recognise the pattern. Low carb is not always easy and it is still controversial in the treatment of diabetes and for that matter bipolar, but my experience is that it works.
For a start, you could adopt a low GI diet and avoid spikes and see where that gets you to. There is also the part about just take responsibility for your mood whatever it might be, your fault or not, and remove yourself from the situation. Can feel a bit unfair when you feel 'right', but in the end it is about behaving around people in a way that will allow your friendships to continue when whatever mood disappears again.
But in short, if spikes make you angry, avoid spikes.