Wow, that's a lot going on. I remember you've said that finances are tight, so that suggests no couples counseling? Anything else available along those lines? It seems like you're working to communicate but things have been going awry - it's too much at once to be able to keep up, even if you actually
are Superwoman!
Do you have any options for therapy at all? Even if just for yourself, it would probably help you deal with the situation - but it also sounds like an objective third party would help you and your husband work things out. There are a lot of stressors going on besides your mental health, between the kids and career options and possible relocation. Really, that would drive anyone batty.
Keep hanging in there...