[Shaun]

From what I've heard from you yourself it sounds like your other sister (who I assume has no desire (yet) to go Stateside too) is responsible and a pretty good person who could stay here and look after your mum... I don't know the severity of your mum's condition because every time I've heard her she sounded quite normal and fun and nice and everything but obviously that's not even a hundredth of a real reflection of her lol, but I think you're maybe giving yourself a lot of guilt and responsibility and duties that you don't really need to do, to stop you from going transatlantic and being happy?

Obviously 'the bitch' would be a problem if you do go there (and I do advise you do if it makes you happy) but I would assume you'd eventually find your own place to live anyway and wouldn't have to deal with her for too long? And a lot of the problems you've said about her interfering and putting distance between you and your father would surely dissolve a little if you were actually there and could talk to him and be honest without any lost-in-translation or miscommunications.

But yeah ultimately I think most of your stress stems from trying to be the best person to as many people as possible and ultimately that's impossible. It should never be your job to keep the family together and keep everyone sane and safe, and ultimately they're just making you unhappy anyway, so you need to do what you want for a change.