It sounds like you might be dealing with environmental allergies rather than a standard cold, which is why your previous medication was not effective. I suggest trying a non-drowsy, second-generation antihistamine such as cetirizine, fexofenadine, or loratadine. These generic medications are highly effective at relieving sneezing, a runny nose, and itchy, watery eyes. Additionally, using a sterile saline nasal spray can help clear your nasal passages naturally and safely. Please stay well-hydrated. If your symptoms do not improve within a few days, consult a doctor to discuss if a prescription-strength nasal steroid spray would be appropriate for you.