Whats wrong with my gall bladder?

For about 3 weeks I had bright green stools everyday. I also felt very constipated. Then shortly after my stools stopped being green I had non stop stools all day. (I had up to 5-6 stools per day) This lasted for about 2 weeks and my stools were regular color. Now all of a sudden my stools are very very dark in color. I am SERIOUSLY constipated and I have and aching pain in my left side of my abdomen