Hey Paul, welcome to the forums.
its a shame to hear all of this, but seeming as i can relate to this (going through the same thing pretty much) i thought it would only be right to put my input in here, even though i haven't found a 'cure' for it all.
it is hard, hell i wake up every morning thinking the same, cry myself to sleep at night, and spend all day doing nothing, no job, no home, nothing except from waiting for a message of the ex to know if i can see my son.
it is difficult, but remember that we only get given what we can handle, yer we may be dealt a bad hand, and everything may seem insignificant, but there are plenty years left in us, and who knows what the future may bring?
the best course of action is to try and keep pushing, its hard to move on with so much pain, but dwelling on the past and occurrences that have happened will only make you sink lower. We have to go out there, start picking up the pieces of our life to find out what our next move will be. You might not be ready to start dating but socialising and bringing something new into your life can help your feelings. You may read this and have the same attitude as me "how is that possible?", well ill tell you how... Self belief.. If you believe in yourself everything will fall together... Don't be ashamed of telling people that you are suffering, don't be afraid to tell people about the rocky road your on, because its part of who you are, and you can only gain strength from these ordeals...
like i said, it is difficult, and I'm not saying that tomorrow you'll wake up feeling like a new man, because we're not built that way, we will hurt, we could hurt for the rest of our lives, but it will get easier, we will be able to manage the pain, and who knows, we could even find happiness. I'm sorry that this has happened to you, and i hope my words have been somewhat helpful... Just remember, everything happens for a reason, and no matter how dark those clouds may seem to be, there is always a silver lining, we just need to reach out and search for it.