What's the cough from? Sore throat? Drainage? Go to Rite Aid/CVS/Walgreens and talk to the pharmacist. They'll probably give you some sort of antihistamine, which will make you a little sleepy but will suppress cold/allergy symptoms.
I understand that people here already gave you the suggestion to drink tea. I just want to suggest more specific ones: Honey Lemon tea and/or Ginger tea. Honey Lemon is great for exactly that, Ginger is just a much stronger alternative. Good luck