I have had diarrhea once a day in the mornings for almost a month. thought it was food related. still is continuing. i have nausea too, in the morning?

Many possibilities: This does not sound urgent as long as you are rehydrating and this is your only symptom, but it has persisted for awhile and deserves attention. A physician can help determine the cause and propose solutions. Possibilities are wide ranging and the more probable ones include medication side effect, irritable bowel, food intolerance, hormone imbalance, etc. A good sign is no diarrhea while asleep.