Re: feeling so down :(
Can you get out for awhile? Take some time for yourself, away from the kids, away from your husband, and just go and do something for you? It sounds like you are exhausted, overwhelmed and immensly frustrated...I know the feeling.
And yes, I'm sure you will bounce back - you are an incredibly strong woman who has had a crippling load of issues to deal with, so there are going to be days when the light at the end of the tunnel seems to be blocked out by an oncoming train.
Just keep putting one foot in front of the other...you'll get there in the end.