Every year around late fall through mid to late spring I get a sever cough. No fever, chills, headaches, muscle aches or any other symptoms. Never happened until 3 years ago. I have no allergies. Nyquil worked the first year not the second. Musinex worked the second year. And both took weeks to clear up the cough. Is there any other OTC medication that might help me get over this more quickly? And am I overlooking a possible cause for this?