There was only so much he could do by way of being perfect. Hell, he did the best he could, considering he was a Nobody without any heart to guide him along. Sometimes it got to be too hard for him and he often times got to thinking about it. He'd think about what was going on and where exactly he was hoping to go with it. That would always be when he noticed he was 'angry', or at least, angry for someone lacking the key to emotions. Whenever he began to think about the cause of his problems, he'd realize this. Whether or not he did anything about it depended on the circumstances and where he was. Once or twice he went so far as to do something he regretted later.
He didn't break anything (at least not in a material sense), though it always caused him the most pain out of all his reactions to frustration. A few times, he hurt himself, though always where no one could see it. Nobodies had no emotions, or so he had been told, so he wasn't expected to ever react to what went on around him. Larxene might've called it masochism, though she was a sadist, so her opinion didn't count.
He tried to end it once, though it didn't go over too well with the rest of the Organization. Their numbers were already being whittled down by Sora at that point. When he faced Sora, it only made his regret worse, his anger deeper, his hatred of being a Nobody more intense.
When his turn to die came, it was more of a rest than anything else. No more anger, no more frustration. Someone had called death a release, and now he knew for sure that's what it was. Although, dying with regrets came with a price, it didn't come too soon. Everyone had regrets, though when they died wasn't always the same.
There was nothing left for him now; all he could do was accept his ending. No more, it's the end of the show, the puppeteer's off and died on up. Fin. Thank you very much and goodbye, the theater will be closing for good.