 [ Symptoms ] i have suffered from severe headaches and migraines for years [ Disease ] i strongly suggest you return to your health care provider to make sure you have not developed a clostridium difficile infection as a result of your antibiotic therapy watery diarrhea that lingers for a month after taking antibiotics can be a sign of this infection which is highly contagious meanwhile be sure to maintain vigilance with handwashing antiseptic hand rubs are not effective the c diff infection you need to wash your hands frequently with plain soap and water then dry thoroughly this will help you avoid passing the infection to someone else if in fact you have it you also need to maintain your hydration be sure to drink plenty of plain water and have a sports drink when the diarrhea is particularly bad if you do have c diff your doctor can treat it with a different antibiotic i wish you all the best with this