What's the best way to prevent period pain for next month ?

Birth control pills: For true prevention, the birth control pill (or patch, ring) are the best bet. Most women find they make their periods lighter and less painful. Another option is to take a non-steroidal anti-inflammatory medication as early as possible for the first 24-48 hours of each menses. Examples are Ibuprofen 800mg every 8 hours or Aleve (naproxen) 2 pills every 8-12 hours. Taken early it works best.

Period pain: First, diet and exercise are helpful and always a good starting point. If you have no stomach problems, pain medicine like advil, Motrin and Aleve (naproxen) provide good relief. The next step is a course of birth control pills, if there is no contraindication. More than that, you need to see an expert.