Can instability of the mood influence the intestine?

Hi doctor,

I am a 19-year-old female suffering from IBS for three years. I always get a severe attack twice a month or more. Before two years, I started taking treatment with Libricol. I am taking Benzodiazepine for insomnia until now. Whenever I go to sleep, I feel like my heartbeat is becoming low and it is going to stop. I know that it is physiological but I cannot stop having this feeling. Now I have become a moody person. I smile, laugh, cry, get angry and regret it within five minutes. Sometimes I swear for it. It causes huge problems in my family. Most of the time, they give excuses to me. But now, they are not willing to talk with me as I am cursing them a lot. When I am normal, I do not use these bad words. When I get mad, I throw things. I regret it myself and I beg for forgiveness in my family. I need a solution to this problem. I am willing to visit a doctor soon. Please suggest.