"K", it could be just about anything causing this, the planets, PMS (for us women), seasons, people annoyed their vacations are over (I haven't had one in 10 years) family stresses, daily traffic and road rage, etc.
Glad to say, "yes, it comes and goes" it is just getting through it and over it that is hard for all of us (boy, do I know, ha!ha!) oh yes, another thing peri-menopause and what follows can make us ladies more "crabby", gee, let's see what the others can come up with, will be interesting, eh?
All I know is that I hope my "crabbiness" leaves me soon, I can't even stand being with myself, ha!ha!
Wish me luck y'all,
"darkeyes"

In giving advice seek to help, not please your friend
SOLON