Keep a calendar handy, because it's always helpful to know when PMS may be looming. If you forget to keep track, watch for signs, like
How does one combat PMS? It's very simple: chocolate. Milk chocolate, to be specific, with a side of foot massage. DS13 has already told me that for Mother's Day, I will be receiving coupons for five foot massages. Does that tell you anything? Foot massages could solve the Middle East issues, I tell you. There's nothing like having one's feet rubbed, especially when it feels like some body parts might explode, implode, or just plain fall out. But back to chocolate -- it solves a world of evils, but you may as well just stock up on everything, because sometimes, eating everything in your path is just the thing to do.
Music might also help, but nothing sad. You might try something like "She Drives Me Crazy," by, ironically, the Fine Young Cannibals. Sadly, the group was never heard from again, once they recorded the song. Perhaps the mother ate her young.
Wearing soothing colors might help to assuage The Mood, but likewise, be on the watch for what she's wearing. If it's anything in red, like this Lorraine lounging robe, tell her she looks mahvelous, then back slowly out of the room. If you see The Look, grab me that little pretty, available now at Damn Good Vintage, and pass me the bonbons.
I just might let you live.