I am so sorry to hear that nothing is working for you. I am concerned that you are not getting your nutrition as it is most likely being compromised from all the diarhhea you are experiencing.
The most common causes of diarrhea include:
Viruses. Common viruses that cause diarrhea are Norwalk virus, cytomegalovirus, viral hepatitis and the herpes simplex virus. Rotavirus is the most common cause of acute childhood diarrhea. Viral diarrhea spreads easily.
Bacteria and parasites. Contaminated food or water can transmit bacteria and parasites to your body. Parasites such as Giardia lamblia and cryptosporidium can cause diarrhea. Common bacterial causes of diarrhea include campylobacter, salmonella, shigella and Escherichia coli. Diarrhea caused by bacteria and parasites can be common when traveling in developing countries, and is often called traveler's diarrhea.
Medications. Many medications can cause diarrhea. The most common are antibiotics. Antibiotics destroy both good and bad bacteria, which can disturb the natural balance of bacteria in your intestines. This disturbance sometimes leads to an infection with bacteria called Clostridium difficile, which can also cause diarrhea.
Lactose. A sugar found in milk and milk products, lactose is a common cause of diarrhea in some people.
Fructose. Fructose, a sugar found in many fruits, is a common cause of diarrhea, especially in children.
Surgery. Some people may experience diarrhea after undergoing abdominal surgery or gallbladder removal surgery.
Other digestive disorders. Chronic diarrhea has a number of other causes, such as Crohn's disease, ulcerative colitis, celiac disease and irritable bowel syndrome.
Wish I had more to offer. Hope that you continue to look for that one physician that will be able to help you. Also talking with a dietician may be a wise move for you.