Chondromalacia syndome, anyone help?

okay so about a year ago I got diagnosed with chondramalacia patellae syndrome and got reffered to physio. I did this for a few months and it started getting better so they discharged me. In the last few weeks my knee's started getting worse again and the physio doesn't seem to be helping anymore. It hurts to straighten or bend my knee completely and kneeling is impossible coz of the pain. I'm trying to stay off it as much as possible but some things i can't avoid like college. By the time i've got home from college my knee is swollen from walking on it. by the time i go to bed i can hardly walk on it. should i ask for crutches?