So sorry, you're feeling so 'wobbly'. i felt similar last week. I actually wrote about how I wouldn't care if I died and how I wanted to crwl into bed and never wake up. Today, I re-read my whole thread and I have to say, I was really shocked at how low I actually was.
I guess reading it with a clearer mind made me realise quite how desperate and lonely I was. That was the low point of 8 months worth of feeling shit and anxious, actually 17 months as I felt pretty low throughout my whole pregnancy too, despite planning ds and being excited, I was terrified and felt very isolated too.
The only 'help' I can give you is this..
Last week I felt the same as you do now. This week, although my situation is more or less the same, I don't feel like I did when I started that thread. I honestly was so shocked to believe I had actually felt those things. It's almost like the sadness and the desperation just took over and I had a melt down. Quite scary, almost like reading someone elses feelings and emotions now.
I'm so sorry you are out there feeling like this. Remember that you aren't alone. There is always someone to talk to. I know you don't want to 'burden' your daughters with how you are feeling but perhaps you could arrange things to do with them. 'girly things' that might cheer you up, even if it's just half an hour of doing eachothers hair or something like that! Remember that as they grow older, your daughters will be like your best friends and you will never ever have to be alone.
If my mum were still alive, I hope we'd have become best friends and I think that your daughters are very lucky to have you. xxxxxxxxx