You may have crohn's disease or ulcerative colitis, both known as inflammatory bowel diseases, especially if the diarrhea is mixed with blood and you are experiencing fever.
Weight loss is present, too.
If you have abdominal pain that is relived or not by having a bowel movement, and you are more prone to have diarrhea in the mornings, soon after the breakfast, you may suffer from irritable bowel syndrome.
You may have abdominal bloating, urgent need for having a bowel movement and feeling like you haven't completed your bowel movement.
You may experience cramping like abdominal pain and more constant one at the same time.