My foot

So, my foot has been really jacked lately. For those of you that think it is, It's not Gout!!!. Somehow, the tendon/muscle behind the ankle on my left foot got bruised, damaged, something that cause the ankle to swell up, and because of that I couldn't even walk or sleep. This has happened to my right foot though. What leaves me with a wtf look on my face is the following: Why not both feet? Why