An X-ray can't see soft tissue, such as a cartilage tear. It might be the meniscus, for example. I don't know who diagnosed you or how -- was it an orthopedist? Did anyone move your knee around to see how mobile it is? I would guess your family physician knows absolutely nothing about knees except to refer those who have problems to a specialist. I know when I've had knee problems I had to get an MRI because when I've gotten just an X-ray a definitive diagnosis could not be made. If you had a thorough exam by a specialist it might be they determined you just sprained it or tweaked it, but when I was diagnosed with that I was sent right away to a physical therapist. After years of off and on conflicting diagnoses it's probably tendonitis but could be a meniscus problem, for me the MRI didn't show anything but that's the test that shows the soft tissue that is usually a problem with a knee if there is more than just a tweak. By 6 weeks it's kind of late for anti-inflammatory and ice and such, you do that right away. You might continue icing your knee for the rest of your life, but just for comfort. Hopefully, you just twisted it, but whatever you did, if it's still this bad this long after you did it I'm just surprised nobody sent you for an MRI or to a physical therapist. And when you say not torn, again, torn refers to cartilage, and that doesn't show on a X-ray but manipulation can sometimes tell you.
please check your esr , aso ,RA, c reactive protein, uric acid . if you are ok . nothing to worry about it . first tell about the result