It doesn't sound like you have talked to a doctor
about this problem yet, so my first piece of advice would be to set up a visit as soon as possible with your primary care doctor
. Abdominal pain that goes on like this without getting better definitely needs to be investigated with a thorough physical exam and potentially some other testing as well.
There are many causes of abdominal pain, and it is hard to narrow down the list of possible causes just from the information you provide in your question. Diffuse abdominal pain on the entire left side of your abdomen, such as you describe could be caused by trouble with constipation, or irritable bowel syndrome
. It could also be caused by a range of different food intolerances, like lactose intolerance or celiac disease. Infections of the intestine by different viruses or bacteria can also cause these symptoms.
Sometimes abdominal pain is a sign of a serious medical problem require immediate evaluation. If you have severe pain, bloody bowel movements, or fevers, then you should go to see your doctor, or go to an emergency room, immediately. Otherwise, schedule the earliest office visit with your primary care doctor that you can get.