Bex, you will not get a better position or a better job in aviation.
BA are not perfect, and they have their own share of problems and unhappy staff, but nobody is perfect. Flying is not the job it used to be. In BA there are so many options you could pursue. Different fleets, different bases etc. The grass is not greener elsewhere, the grass everywhere nowadays is a shade of brown.
I would willingly swap with you if it were possible.
Having said that, family and home life are very important. I did not realise how important they really are until after I got divorced and, trust me, you do not want to go through a divorce - especially with children involved - if you can help it.
So my advice to you is to stay in BA and go part time and find a way to live within your reduced means. Or apply for a ground training position perhaps.