I can only echo what luluj is saying, Mark. And, earlier I meant, as others keep saying, focus on the positives. I know it's hard -- but you have to FIGHT to keep the negatives at bay. Think about what you HAVE got ... the important things -- a loving and supportive wife, great kids who love you, a decent salary (no ifs, but's why's or maybe's).
I have been where you are (indeed, I am almost back there now) and I know you have to fight to get back to normal --- doesn't have to be a superhuman feat -- a little step at a time will do it -- but you MUST stop looking at all the negatives. We all have those in the cupboard, but we look to the positives.
My opinions are merely that .. opinions based on experience. Always seek professional advice.
IVA Completed 23rd July 2013 .... C.C. 10th January 2014