Knee Damage / Injury

I have been running for a year and cover on average 20 – 30 km a week. I have recently hurt my knee and during my first visit to a physio yesterday was told it was posterior cruciate related and a tendon was being squished (??) hence the pain and swelling. He said I should be alright to run in 48 hours and “loosened” up the knee which he said was very stiff. He checked my leg length and pelvis and all was fine. However, 24 hours later my leg still hurts and feels quite odd, as if the circulation is cutting off somewhere. Has anyone else had experience with this kind of injury? Could it have been caused by the fact that I am 6 kilos above my weight range? I don’t play any contact sports.
thank you in advance for any advice you can offer