Danielle,
It's possible that since you jumped in and started going 120% you wore down the cartilage in your joints. Pretend I have done this and ... am on the verge of doing it again. My better half introduced me to something when I first met her, she was suffering through a knee injury and Insanity was killing my knees with all the jumping.
TriFlex by GNC. This particular one is the fast acting .. in three days I felt great again.
http://www.gnclivewell.com/triflex/fastacting.html