You'll be glad you did. Salt causes water retention and increases that marshmallow woman feeling. If you want to lessen pre-period moodiness the extra strength skinny double latte will have to go. Replace it with the skinny de-caf double latte to keep the irritability meter in check. Skip the coffee, caffeinated tea and sodas too.
Some people even say chocolate needs to go too.
No pretending it's going to be easy. But a month without uncontrolled moodiness could be worth it. Many drugstores and health food stores sell special PMS tea, labeled as such, but any kind of caffeine-free tea would be nice. Ask a doctor or other health care provider for advice. Try to take care of yourself and exercise moderately on a regular basis.