are these thoughts normal for a FTM?

I had my son a few months ago and I'm so absolutely in love with him i don't let anyone babysit him or be in a room alone with him. I feel like people want to kill him or are going to hurt him on purpose. I always have the scariest images in my head like if I leave him on his play mat and come back from using the bathroom I'll find him horribly dead or if I let my little sister in law hold him she's going to throw him across the room - she's 12 and no real reason for me to think that. Its been getting worse the last few weeks I can't get these images out of my head like I try my best not to picture them but my brain keeps shooting out worse and worse images 😕 I have had depression for many years now not sure if it's related . I'm 22. Is this normal?