How can one increase his/her emotional stability? what medications?what foods?excersice, meditation? what else? any studien on this that you recommend?

Emotional stability: You've got the most of it. 0 cigarettes, 5 servings of fruits and vegetables a day (and a multivitamin), at least 10 minutes of relaxation daily, maintaining bmi < 30, and 150 mins of exercise a week. The other uniquely effective path to emotional stability is a meditation practice. Try reading jon kabbat-zinn's "whereever you go, there you are." and start slow, only 5-10 minutes a day, and build.

Abdominal breathing: Studies have shown that meditation can have positive effects on your autonomic nervous system, your immune system and your hormonal systems, thus rebalancing your overall metabolism. Proper abdominal breathing techniques are paramount in achieving the relaxation response. You do not need to be a master. Find someone who can teach you this and then practice it consistently.