@Rusne , one thing which seems to happen quite often is that newly dx'd attack it head on, read all the books etc. get ratios and the rest of it sorted out, but there's still a kind of novelty about it all in the first year, then the reality that it's for life sinks in and they can become very dispirited, and/or, as you say, experience inner anger. It's like a delayed grieving. Doesn't happen with everyone but it's something to keep an eye on. If it happens, it's generally just a stage, and most people eventually move on to a stage where it's like, yep, got T1, it's for life, whatever.
This might sound a bit new age hippy, but what works for me is to think about it not as an enemy, a war, but as a small part of me has gone wrong, so I need to help it, care for it, like I would do with my nephew. I don't fight it, I cooperate with it. Sure, it's a bit of a mind game, and I do still get narked about it from time to time when it's not playing by the rules, but on the whole, it's a better mindstate than resenting it.