I've noticed that when I'm easily irritated, it's actually a sign that my depression is returning in full force. It got to a point where it was seriously impacting my relationships with people. Anything could set me off, silly sounds and stuff, and I'd get intensely angry over the stupidest things. I recently revamped my treatment plan and started medications and my irritability has gone WAY down.
But yes, dragging feet STILL annoy me as I walk around campus...