Thanks for the query to H.C. M. Forum.
The pain in both knee with recurrence and sore throat
and headache are an indication of infection in throat ( may be strep, most common).
Anadin is just a pain killer, so its for relief , not for cure.
In my opinion consult a physician and get his opinion.
As reason of pain in both knee means osteoarthritis
or rheumatoid arthritis
( in beginning this occurs in small joints).
Get in blood for C B C, E S R and rheumatic factor.