I was at this stage about 2 weeks ago, I left the house, kissed my little girl goodbye and said I'm sorry, I'll see you again sometime. I walked towards the railway lines and turned off my phone and was in the grip of desperation.
However my daughter drew me back, I had a friend who committed suicide when I was only 20 and they obituary didn't even come close to describing the person he was and I thought to myself I'd never do that to anyone. I'd never take away the one thing they love just for my own selfishness, sure suicide can be brave and it takes an element of courage but in the end it is an act of pure selfishness and we all know it, all of us who've thought about it.
Since then I've had many happy moments, strangers talking to me for random reasons, helping people who've dropped things and generally just starting to recognise life is not only about the partner we had but about us too.
I've found a new job when it appeared I'd not really have a hope (dunno if it is gonna work yet), spoke to so many random people and just generally added extra words to random conversations and smiled at them. Sure, many don't smile back, many couldn't care at all what your life is doing or even if you were gone, but some do smile back, some do give you time and some do fill your heart with that little bit of hope to put one foot in front of the other.
Now I'm struggling still but suicide is not my first thought, my Daughter is and maybe, just maybe get back with my ex, but if I don't I'll show her that she's missing out on something she should never have turned her back on and you can too. I believe in you, don't give up on yourself, don't give up on your children, tomorrow, or maybe sometime after that, but soon, you will find happiness from other sources and you'll be glad you never took away your chance to find it, or indeed make your children's chances to find it worse.
My thoughts are with you.