I usually make up mixed formula remedies. A good remedy for you would be Chamomile, Lavendar, Borage, Fuchsia, and Yerba Santa.
More important might be nuritional support for PMS. I would recommend Calcium 1,000 mg, Magnesium 500-800 mg, GTF Chromium or Chromium Picolinate, and B-Complex Vitamins. It would also be good for you to take the herb Milk Thistle Extract for the next three months to cleanse your liver, since with would help metabolize any extra estrogen that is still around at the time of your period hormonal shift.