Yes, I'm A Male, 32 Years Old. I Am On

Yes, I'm a male, 32 years old. I am on suboxon which contipates me severely. My bm's are everyday however, very hard and a few at a time. I began drinking prune nice as of a week ago and every time I experience stomach pain. I drank about 14 fl. Oz. 45 min. Ago and the pain is so bad I am laying down in bed. Cab this be normal and pass or what's the deal????