Oh sweetheart, I am sorry you are feeling so awful 
4 years ago, I was suicidal. I was depressed, had chronic, unrelenting insomnia, I had lost my job, I was addicted to sleeping tablets, I was single and had lost most of my friends, and I had no idea how to pay my rent.
It was horrendous.
I had been going to the doctor for help - I had been on citalopram, fluoxetine, sertraline and trazodone. None of them had helped, in fact, some of them made me worse. I thought I couldn’t be helped.
Thank god, before I did anything stupid, I went back to the doctor one more time, and I was prescribed Mirtazapine. I took it out of desperation, thinking none of the others helped, why would this one?
Well, it turned my life around! Honestly, it pulled me out of a pit of despair. I always want to hug that doctor who prescribed it for me. Now I am healthy, happy, in a new career and with a wonderful partner.
Keep asking for help. I know it feels pointless, but it isn’t - there is something out there that will help you. I know how dreadful this feels, but it is temporary. You will get better. Your little boy needs you. 