Help please

I have an appointment to get all this sorted but I'm just wanting others experiences/thoughts and advice please!

I have a two year old and are currently in the third trimester of a second pregnancy, which I'm really excited about.

My first pregnancy I had no anxiety or depression at all where as this time round I have really bad anxiety, not to do worh baby, but more something happening to me, my hubby, or my first born, specifically dying suddenly and cancer and it consumes me!

Has anyone experienced something similar, did it stop after you had your baby or what happened?

Thanks in advance!!