Hi LilyPo, welcome to PsychCentral. There's lots of other people here from the UK and most everyone here expresses feeling a bit lost and lonely at some point.

Can you see a counselor or anything, talk over the problems with your sister and husband with someone impartial that isn't a friend or doesn't want or need anything from you?

You don't need to save your husband, especially if he doesn't agree and is unwilling to be saved. He could help save you because you wanted saving.