Low carb dieter looking for support

Hello,
My husband has several health problems and it's vital that he loose weight. I am very overweight as well and often suffer from denial and depression.
Anyway I half run two different types of eating style trying to satisfy his needs at no avail. First he has bad digestion so we went from meat eating to vegetarianism. Then read some where that the human brain MUST have a meat protein called casein to properly function. So it was back to meat. now his doctors say Lo carb diet. and all this has been since the first of this year.
I am totally confused as to what to buy and how to cook it.

The real problem though is trying to but two adult men and myself enough of whatever food for 400.00 a month. They cost are crazy. We are trying our luck at putting in a garden this year but lets face it , that isn't cheap to get started either.

So anyway I'm looking for others that are trying to lose on a lo carb diet to share hints and to mentor me, before I go off the deep end.