Returning to work at week four is very ambitious. Did your OS suggest that time line? Mine right out told me 12 weeks, but I of course thought I could return to teaching at 8 weeks. Guess what? I returned to part time teaching at 12 weeks. But just to help you feel a bit better, my ROM continued to improve well into a year and at 2 years realized I could squat in a pool. In my opinion there is nothing easy about this recovery, patience is needed, fortitude, a strength of will and in my case, a great deal of faith. It is ok to feel defeated at times and when that's the case this is the place to come, but you are getting better little by little, day by day. Remember it hasn't been a month yet in this long recovery.
Week 4 was when I began to feel a bit better, after that complications arose so I can't compare my experience to anyone else's. I did a some cooking, cleaning and felt less pain. But hopefully next week you'll see a bit of a difference as well.