What jumps out at me about your posts is that they are all about you, and you don't seem to be giving much thought to your current or potential children.
I cant stop the feeling of wanting another child. I had kids young so kids is all I know.
That is totally understandable, but this is an opportunity to find something else in life to 'know'. The welfare of a child is more important that your feeling of wanting one because you don't know what else to do with yourself and want to fill the hole that losing your children has left you with.
Im scared ill fail the assesments and mess it all up again and I cant go through with that again.
Again - this is all about you: what about the effects on your children if you 'mess it up again'?!
im worried the stress of it will send me over the edge if I get it wrong.
This statement makes it clear that are not stable enough to gamble with another child's life. Not at the moment.
Im just trying to regain whats left of my life I want to be better thats all.
I totally understand that - it must be an incredibly hard situation to live with.
Honestly, you need to focus on being better in all the other areas of your life, not by gambling on having and being allowed to keep another child. The stakes are too high. Focus on building a life that doesn't involve getting pregnant, and focus on trying to get your children back, or at least playing as active a part in their lives as you possibly can. You are still young and have time. Get yourself stable - properly stable, so that you're not wobbling around looking to bring another child into the world just to heal your pain.