Update
Saw the doc for the 4 month follow up last week. He used the word miraculous twice during the visit, once when he was looking at the x-rays (you can barely tell there was a fracture now), and once when he saw my range of motion. I am now able to put my palms together over my head with only minimal pain, and am able to touch my fingers of both hands together behind my back, although that still hurts a lot. When I told him I'd been taking Vitamin D every day to try to help encourage the bone to heal, initially he pooh-poo'ed it, but this time when he was looking at the x-rays he seemed a bit more intrigued. When I told him how hard I had been working at PT he congratulated me and said that if everyone pushed hard as I did there would be more people like me doing well at this point.
I really had been in a bit of denial as to how serious this fracture was until I showed the original x-rays to a friend who is a radiologist who gasped, and then laughed, when he saw the images. He told me that often when he sees the 10-day follow-up x-rays for this bad of a humeral neck fracture, the arm bone has "fallen off" the head of the humerus, so he also told me how lucky I was!
It's very strange how fast some of my strength is coming back and how slowly other parts are recovering. For instance, as of last week I am back to doing push-ups with my feet resting on a 65cm pilates ball, and although it hurts I can tolerate it. On the other hand, I can only do 5 pound overhead military presses. (I was up to 45 pounds each arm prior to the injury.) Anything more than that is not possible. I am unable to do pect flies on a machine because of range-of-motion limitations but I can do pect flies lying on a foam roller, but again only at five pounds. Well, at least it's coming back slowly.
Still waking up 8-10 times at night because of cramps in the shoulder but it doesn't hurt NEARLY as much as it first did. Migraines are back unfortunately. That returned about the end of the 3rd month. I'm also occasionally having to take a muscle relaxer because all of a sudden the muscles in my neck and back will lock up in spasm. They tell me that's a leftover of the whiplash part of the injury.
So, 6-10 months to stop hurting may be realistic apparently, and I suspect that it'll be a year and a half before I'm really back to normal. On the positive side, I played a round of golf and shot a 97, which for me is really good. On the last weekend of skiing at Mammoth, I was feeling so good while skiing that I took a 12-foot ramp kicker and stuck the landing, but oh boy did my shoulder complain for a few minutes afterward because of the deceleration. Well, at least I can ski and lift weights and play golf and work and I'm not crippled!