darkriver I've not been in your position OP, I am mum (by adoption) of a boy aged 7 and birth mum to a teenager. I have had OCD and also anxiety but not the mental heath issues you are facing. Just wanted to be open.
Your decision is definitely very brave. Only you really know what is going on in your life.
Please can I give you one small plea. Get the help you need.
You are important, you are special, both in and of yourself and also in relation to your children, even if they will be cared for and brought up by someone else.
Please, please get all the help you can, use this time, as hard as it may be, to ask for help and access it.
You should be offered letterbox and this will enable to you to keep in touch with the person/couple who adopt your children (assuming this all goes ahead as you suggest) once a year (we have letter box twice a year with photos).
Letterbox will enable you to know they are safe and well and to be able to tell them things about yourself and your life through the letters.
You are very vulnerable and I really hope you will find a reason to live, to find the joy in life where it may be found.
Maybe without the need to provide day to day care for your children you will be able to work out what is happening in your life and why you feel as you do. Hopefully, the decision to relinquish your children for their benefit is your own decision and I hope you have support in this.
My dd has had some mental health issues and often feels sad, depressed, we are working through this with help. I know this is different from your situation. But I am saying it because I love my dd so much and only want the best for her. I don't know if you have people in your life who can provide that love and care, possibly not at the moment. But one day you may have, so please do not give up hope.
Your children will grow up, and hopefully they will be able to understand more and will be able to understand your story and how life has been for you.
Anyway, I don't know if what I am saying is helping at all but there is always a reason to live. And having children means, even if you will not provide the day to day care of them, that you have an investment in the future and you have something to live for. Please, please get your help for you and find your way forward. You are of huge value, brave, and caring, (it is evident even from your few words), and you can work through this. XX 