When we got back to the apartment I still felt extremely tired, and Alejandro convinced me that I should see a doctor. We went to a nearby pharmacy with a "consultario médico“. The doctor took my temperature (I still had a low grade fever), listened to my lungs (they were clear) and looked at my throat. She said that I had an infection, and made out a prescription for three drugs that I should take.
The consultation with the doctor cost 50 pesos... less than $3 U.S. ... and it cost me around $25 U.S. to fill the prescriptions.
This morning I am feeling considerably better. I will stay in the apartment except for a quick trip to the supermarket. I'm going to make myself a pot of chicken soup.