I recently got a knee swelling. Should I rest or move around like I normally would?

Hello doctor,

I am a 28-year-old female. My height is 5 feet and 4 inches and my weight is 123 lbs. I was suffering from a knee problem, and I took a rest for a couple of days. I took Alphintern and used my resistance band to improve my knee range and everything was fine, except for a grinding noise during exercise. But, it did not bother me while walking. I sought medical help and I did an MRI and the results were 'increased girth and altered signals of the anterior inferior cruciate ligament, suggestive of a sprain with minimum knee effusion'. The doctor advised me to walk normally, not to fully bend my knee, and not to stand Later, I used the stairs and walked a little. This gave rise to an enormous amount of pain. I was unable to walk correctly or even bend my knee a little. Knee edema occurred. I took a Diclofenac epolamine 65 mg capsule, a Glucosamine sulfate capsule, and a pain relief gel. My doctor prescribed me these medications for a month, and he did not recommend any physiotherapy program. He just informed me that it is alright to walk, as I normally do. My question is, is the edema something that will normally occur whenever I use my leg or is it a complication? What are your recommendations and precautions? Should I rest or move around normally? If I have to keep at rest, for how long should I do it? I am a very active person and my concern is that things are getting worse. So, shall I begin a physiotherapy program or must I wait for a month until I take my medications?