I don't want to be the voice of doom for you (lol not).
However, in my opinion you should have had your surgery.
As extremely painful as the Iovera treatment was (I also screamed) & the feeling of a wooden leg with stiffness up until recently, that is the entire idea to sharply minimize your pain after your surgery & during the weeks following going thru rehab p.t. The nerve freeze with the nitrous oxide will definitely subside. It just is different with each person. Both of my knees prior to surgery were totally bone on bone & absolutely no cartiledge left. So it would have just been a matter of time before I could not walk at all. So that is something you need to give careful thought. All of these medical issues will end up passing in due time. p.s. I am a very active 72 year old & I believe that is why my surgeon released me to drive just after 3 weeks. However, due to pain, I postponed it another week. Am overall doing much better now. My P.T. therapist advised me on Saturday after my session that most knee replacement patients can expect some degree of pain & swelling anywhere from 6 months to a year. Hope my thoughts were helpful. I hope to have my other knee replaced at least by next summer. Or I will end up walking with a severe limp as my left knee has almost given out now.