Good luck to you. I must say that doctor does seem too conservative re: his attitude. Glad you are seeking another opinion.
I know when I first got out of the hospital I thought getting my knee to bend would have taken an act of God. Then I started physical therapy.
My therapist would tell me to “hold on tight” and she would physically force a bend a little bit more every session. There were many days I would be in tears. I am happy she did it though…I am 12 weeks post my surgery and I have just about all of my ROM back.