Go back to the same doctor first, as he knows your situation. If you don't think you're getting proper attention, which is unfortunately common with surgeons, then see someone else for a second opinion. But of course you broke your arm twice in the same place, and surgeons aren't miracle workers. The body is what it is, and while our medical system is predicated on improving what nature gave us, that doesn't necessarily happen in real life. If you're losing feeling in the hand something is pinching on a nerve, most likely. Whether it's completely healed or not nobody here can say because we're not experts and don't have any diagnostic images to consult, so that's why I suggest you first go back to the surgeon who knows your arm. Only if you're not satisfied with that should you consult someone else. Hopefully, you just need more time, or some adjustments. Hope it all works out for you.