Irritating Knee pain?!

I play sports consecutively almost everyday!. I hurt my knee one day but I ignored it and played even more sports!. Just some days ago I felt my knee collapsed on me!. It was hard for me to walk and I felt that my knee was loose!. The next day it felt good but with the same irritating pain!. Now, I'm taking a rest for about a week because I have a big football game coming up!. My knee doesn't really hurt that bad!. I just have this irritating pain at the back-right side of my right knee!. How long would it take for a knee injury to fully heal!? Www@Answer-Health@Com

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