Talk to Rheumatologist on Right Knee Pain

The cricled area hurts, and has been gradually swelling since November when she took a 28 hours long flight back to pakistan, sitting in an uncomfortable position throughout the time. This must be the reasons for the pain, she says, which triggers only while sleeping on her right side as soon as it weighs down under the other leg. Once triggered, pain killers or creams doesn't help much. Patient's other info -Breast cancer 2012 -Weak bones -No sugar or bp issue -Overweight -No prior injury Your suggestion would really help us let off as we both are worried about it. Thank you in anticipation