My mouth inside is swollen from the top back, when I swallow my mucous it hurts in that top back area.

Dr. can check throat. Throat pain can be from a strep throat infection (antibiotics are needed), a cold or influenza (antibiotics usually not used), or from some other cause such as allergies or irritants. Usually, a person sees the doctor if the sore throat is bothersome, recurrent, or doesn't go away quickly (mainly to check for strep). Allergic throat swelling is a medical emergency... means an ambulance to the ER.