Suggest Treatment For Sore Throat, Chest Pain And Dry Cough

I started with sore throat and chest pain eight days ago. I thought that with rest and plenty of fluids it would progress through other cold symptoms and go away. Instead, I m stuck with a dry cough in addition to the original symptoms. I do have a runny nose occasionally as well as sneezing once in awhile. I do have seasonal allergies. I started taking over-the-counter 1200mg Guaifenesin two days ago. The coughing seems to be less but the chest pain and sore throat are unchanged.