What do i have, and how do i treat? symptoms, fever, pain on left side abdomen, gas, watery diarrhea, going on almost 3 days now?

With this combination of symptoms -- abdominal pain, diarrhea, and fever -- you need in-person care to check for the cause and best treatment. Probably you need an antibiotic by prescription. See a doctor ASAP. Good luck.

Persistent, significant abdominal pain for more than 24 hours recommend urgent in person evaluation ,for serious problem that might warrant emergency surgery like appendicitis or infection