Knee Injury. Was very swollen they di!

I'm a 22 year old female and I'm suffering from knee pain. I injured my right knee February 10, 2017 and I went to the hospital and was put in a knee immobilizer and crutches till February 13 when I was scheduled to see an Orthapedic who told me to keep the immobilizer on a few days more. I work in a kitchen as a cook and my work involves me walking, standing, kneeling, bending, lifting etc. I was given a note of modified work / being off work 2-6 weeks till my injury fully heals and I would be examined again April 3, 2017. However my knee has been giving out sometimes if I'm walking or even just standing. I noticed my knee cap moved around a lot. Compared to my left knee the right knee where the injury occurred it moves a lot. I know your knee cap is supposed to move a bit but mine moves a little too much... it's frustrating me that I'm living in fear of possible hurting my knee again and not knowing what's wrong. I had an X-Ray done February 10th but my knee was very swollen they di