Evian/TOH.....right ...different problems i would suggest.
Evian...this sounds very much like a ligamentous strain probably due to some abnormal activity, and it should settle with minimal exercises and Ibuprofen either in tablet form or by cream.
TOH.....yours I'm afraid is more likely to be the result of mild degenerative changes, possibly early osteoarthritis and once again the same advice as for Evian, Ibuprofen, mild exrecises and perhaps a visit to the GP re, X-Rays.
Woofgang is our " resident physiotherapist" and she might have something to add concerning the exercises.