It seems to me the underlying problem isn't about ham & cheese pitas or having kids or any of that, but really the fact that you're bumming around nowhere for ~two weeks with the idea that it's this great present to your mother, while at the same time the resentment you've been carrying towards her has only been amplified by your boredom and isolation, and by the awkwardness of hanging out with her current--which, while on an intellectual level you claim to have come to terms with, the emotional impact of the situation is hitting you doubly so, as this is a situation you don't want to be in within a situation you already didn't want to be in.
Personally I find the best way to manage the relationship with my parents is to pretend I'm way more busy than I really am; this means I can get away with cutting conversations short when I don't want to deal, and, rather than being guilted into spending weeks at a time and overstaying my welcome, I can make spontaneous plans to visit for a couple of days when I want to get away and it's appreciated even more.
