Hey Kelly5419,
You are right, you can't give up because of your son! I can relate, I have a daughter and I can't give up because of her either! Our kids need us in so many ways...and we have to be there for them!
I want to encourage you to look for anything positive you can find and hold on tight...your sons smile, his laugh, the way he calls you when he needs you...I have lots of pictures of my daughter on my phone and on facebook, so if I get down sometimes I will look at her pics and remember why I have to carry on, especially when I am feeling hopeless and lonely.

Hope this post helps you out! Have the BEST day you can Kelly!