I am going to be blunt, because you need to hear it. Don’t read it if you don’t think you can manage to cope with blunt.
You need to take this on board. They are interested in the welfare of the child, only. Their interest in you is only in as far as it effects the child.
I am a total stranger to you, I know nothing about you other than what you have just written in defence of your current life. This is what I can see, and what they will be writing down in their assessments.
You have returned to a relationship with someone who was violent towards you. This will have caused your child harm in the past, and potentially will in the future.
You say he has changed- they see that he is still aggressive, has recently turned to a serious drug habit when things went wrong, and has significant issues from his childhood which are unresolved. This is why they will question your judgement.
You have mental health difficulties, which you are not treating appropriately. I understand your reason why, but they don’t care about your reasons or whether they are valid, they only care about the welfare of the child. If your mental health is having an impact on the child, they will intervene.
You are in a relationship with a violent drug abusing man, and have little support network. You are resisting any efforts to develop those networks because of your anxiety. Again, they only care about the child here- you need to attend these groups, at the moment you are putting your own needs first. If you are too anxious to attend, then get to the gp. If you are too anxious to look after yourself, then you are to anxious to look after a child. What do you do when they need to see a GP?
You talk about building up your little unit, they are telling you this is the opposite of what you need to do. Your little unit has been unsafe in the past, and is not a good bet. You need supports beyond that unit to protect your child if things go wrong in the future.
You are not managing household issues effectively. This increases the stress in the household.
You say everything is going fine, but they can see a potential for so many issues in the future that they are trying to divert you from. Listen to them. They are currently trying to help you keep your child, but they won’t do that for long. Your judgement here is not good, you are making poor choices.
You can either continue to tell us why you can’t do something, or you can make the changes which are necessary for your child. Your choice.