My OS came in to physio to see me after I had a crying melt down with my pt and realized how much trouble I was having. He immediately put me on Celebrex and said if no sign of any change by Nov 22 then MUA because I was down to 55 flexion and 35 extension. Pt stopped all strengthening and does stretch and easy manipulation only until further notice. Rmt is slowly untangling the mess of my soft tissues and layer on layer of scar and adhesion.
I think you should stop all PT and, instead, spend that time resting, icing and elevating your leg, to try to calm. It sounds to me as if over-ambitious PT is the cause of much of your trouble. PT should not make you cry - were the exercises causing pain? That's a bad thing.
9 weeks is far too early in recovery to be doing
any strengthening exercises - they're best left until at lest 3 months post-op, and then only of all other progress is satisfactory.
In addition, PT should not be doing any manipulation of your knee at all.
At only 9 weeks, it's extremely unlikely that you have any scar tissue or adhesions. The cause of your problem is much more likely to be swelling and inflammation of your soft tissues. They were wounded during surgery and excessive exercising makes them angry and inflamed and slows down their healing.
It's not exercising that gets you your ROM - it's time. Time to recover, time for swelling and pain to settle, and time to heal. Your ROM is there right from the start, just waiting for all that to happen, so it can show itself.