Anxiety about having 3rd baby

Hi, im currently 34 weeks pregnant with my 3rd child and im feeling really anxious about it to the point i try to not even think about it.

I had post natal depression with my 1st which i think was brought on by anxiety and i think it has somewhat scarred me for the rest of my life. I felt anxious with ny 2nd but not to this extent. I dont think it helps that this pregnancy wasnt planned and alot of my anxiety triggers are based around life changes.

I am just so scared that when she is born i am going to have raging anxiety and depression again :(

Has anyone else ever felt like this or have any tips on how to prepare rather than block it out? Thanks x