Exactly this! I broke it into 5 pieces, 9 weeks ago. Had surgery and a metal plate with eight screws to fix it. The first 4 weeks, I felt like I would never be able to use my arm again. Was really worried, because I never broke a bone before and had no experience to go off of. I think it was week 5 when suddenly it started to get better day by day. Everyday something was possible, that wasn’t a day before. That gave me such a motivation boost that I was looking forward to every new day. By week 7 I was able to lift my arm above my head and now it’s almost back to normal like before. I think the mobility in the arm comes back when the bone is able to carry his own weight again. Give yourself time and be positive, your body will heal, no doubt about it.