How do I avoid medication for depression or therapy that may be used against me to take my child away?

My kid and I have been through a tough time these last two years. I finally split with his father because of the toxic influence but there was a child welfare case opened because my son complained of his father’s abuse at school and it was witnessed by neighbours. It ended up with a police case where his father was found guilty of abuse and fined and both of our testimony was taken down at a police station, and I was found to be a co-victim of abuse. The child welfare case was due to be closed last month, but one of the case workers is now insisting that it be kept open. I’m at a loss. I’ve done everything possible and I feel so ground down about this threat of taking my child away…. I feel like I need to go see a therapist or go on anti-depressive medication, but they will probably hold that against me. I feel like they are using every little thing to pry me away from my child so he can be raised in a strictly Norwegian house, where any foreign, different influence can be squashed. Because of this, I feel I could really use someone to talk to, but I’m afraid it will be used against me. Suggestions? Can I fight this with legal channels?