I am 19, f, generally healthy.
A few weeks ago I got terrible headaches for several days and then a sore throat that was so painful I couldn't sleep. It felt like my throat was generally very swollen, making it so that swallowing was difficult, uncoordinated, painful, and often pushed matter upward into my nasal passage.
I went to the doctor, and he didn't do a swab or anything, but said "it's very red, probably strep, take penicillin for 10 days."
So I did, and the symptoms went away.
I finished the bottle of pills, last week, and the very next day I had a terrible headache again. Its been about four days, and all of the symptoms are back, including difficulty swallowing and very sore throat.
What could this be, what should I do?