In a quest not to be so stressed out and irritable, I did some research and found plenty of evidence that too much caffeine increases stress and irritability. Since I drink a pot of coffee a day, I decided to cut back to one (largish) cup on the way to work.
I'm currently on day 2 and feel a lot better. I suspect it'll be a few days before I see massive changes but I think I'm on the right track with this. My eye twitch is almost completely gone and I don't feel like unsheathing my adamantium claws whenever someone talks to me at my desk.
A friend of mine told me he had to cut way back on caffeine for similar reasons around the time he turned forty. I've got less than a year and a half until then so it seems the time is right.
I want to get back into writing, though. I dropped down to #10 on the all time Goodreads list over the weekend and it occurs to me that it would be good to get something out there before I fade away.