I'm sorry you are feeling down. When we were 'newbies' we weren't so strong. I definately needed this board to take me by the hand and guide me through it. It is just that as time passes you get stronger.
I remember that a few months after h left I was on my own in my house, very isolated as I can't drive and live where there is not good public transport. I was so ill that I was near collapse from continuous colds, stress and lack of food as I couldn't get to the supermarket and couldn't physically eat anyway. I was also trying to be 'strong' and not show weakness to anyone by not saying I need help - basically being very stubborn! I hit rock bottom and called my Mum who drove up, got me in the car and drove me to my parents house. She put me on the sofa under a duvet and cooked me meals that I picked at and her and my Dad were just 'there' for 4 days until I was better.
I tell you this because I suppose what I am saying is that the majority of us have been there in one way or another and understand how you feel, you aren't alone. It is such a horrible, and for me very lonely, time even when I was with people.
People here on the boards will give you their advice and opinions on your situation and you need to take what you think will work from that in your own situation and implement it.
There is a quote from a Pet Shop Boys song (if you like the Pet Shop Boys it is 'Se a Vida e' ) and it says
'So don't search in the stars for signs of love Look around your life, you'll find enough'
Your children love and need you and I'm sure you have friends and family also. Hang out with them and try to take your mind off the situation. At the moment you won't get what you need from your wife, so you need to take care of yourself. That is something you are in control of.
P.S - re read that post from Phoenix Deaux I sent you, it will help. I also found swimming very threapeutic - I took out my frustration on the pool and it helped boost my happiness levels.
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