My husband is helping me with my exercises but it just doesn't want to bend.
First, stop the exercises. They are feeding your swelling and inflammation, and the inflammation will inhibit your progress and feed adhesion formation. Goal number one is to deter the swelling and inflammation. How? Number one, rest. Keep your activity to a minimum. Any knee efforts should be gentle range of motion. I used a CPM machine and did gentle stretches only that were slow and which I held 30-60 seconds (10 stretches in the morning followed by icing, and 10 stretches in the evening, same icing routine). Scuttle any strengthening exercises for the first four weeks. There is no need to strengthen muscles when your problem now is stretching, and strengthening exercises will only cause inflammation.
Number two, NSAIDs will help with pain, inflammation and swelling.
Number three, how often and for how long are you icing and elevating? I'd suggest a minimum of 30 minutes every two hours, your toes above your nose!! Hopefully hubby doesn't mind trading his PT role for waiting on you hand and foot!
Number four, medicate adequately. If your surgeon is stingy about prescribing pain meds, then go to your regular doctor.
Another thing that helps psychologically and maybe physically is massage. After going through surgery, PT (which hurt), and manipulation, my knee was ready for some tender lovin' care, and lots of it.
Last but not least, the gains after a procedure like this are very very slow. Personally, I trashed the whole measurement thing. It made me feel too watched. It was better to try not to pay attention to the bend. The focus has to be on the process of gentle efforts rather than the goal of getting bend, because when we're hell-bent on bending, we push the knee and the knee rebels. It was weeks after my last intervention before I passed the 90 degree mark and I felt as though I was home free. You're already at 83 and so even two degrees a week, in a month's time, will have you past 90.