Bez,
I haven't been through what you have but can understand why the circumstances you're in would make you feel how you do.
I had the luxury of being able to fade over a long period of time so I had new friends in place and a surrogate congregation that being my workplace. Still it was difficult.
Leaving the community of the KH that you have been in for your whole life will remove so many of your securities. At a time when you are at home with not one but two kids (getting my serious respect right now) is when you need support, friends and as you say a purpose. If those things have been removed then of course you're going to be feeling low, even if you had no medical issues or dealing with the aftermath of a cult.
In many ways it will be difficult for your husband too, although doing a job, being able to have at least work colleagues to spend much of the day with as part of a routine hopefully will make things better.
These are the tough times in life. It does get better.
best wishes
MMXIV