I'm so sorry you're going through this, it's always hard and even more so when you're alone through it. I'm glad you've got your son to keep you going even when the dark thoughts come in.
Try to keep distracted and do things that make you happy (I know that's easier said that done) and remember that the people on here are there for you.
I'm currently stuck without much support in a new area so I understand the immense loneliness that you're feeling and it's brought me back to this site and helped me through one of my worst nights in a long time.

I don't know your situation but definitely try to look for some suitable professional help when you can, I know I'm missing that and need to find someone.

Hope things improve soon!