After the very cranky post of this morning, I spent some time online researching my upcoming radioactive iodine treatment and found a list of hypothyroid symptoms. I haven't looked at that list in a long time, but back in the day when I'd look at it I'd notice one or two things that were kind of relevant. Today it's a f*cking checklist of how I feel, right down to the irritability. Yup.
I suppose it's good to know what this is, now I have to figure out better coping mechanisms.