I have the same problem with elevating my arms with my SFN. Also with holding the iPad, numbness, pain-in hands, wrists, elbows. It feels like an overwhelming painful weakness and it can even make me feel like I could pass out if I hold my arms straight up over my head for more than a few seconds. For a while, it was impossible to put dishes away in the middle and top cabinets. I can do it now but it has to be quick and not more than a few things.
I'm wondering if any of you have terrible neck spasms and shoulder pain with twitching and buzzing. That is one of my most major problems.