Anxious FTM

My son is 10 days old and he’s my perfect rainbow baby. I miscarried my first pregnancy and it took 7 long months to finally conceive my son. I was so worried and anxious throughout my pregnancy, so afraid something would go wrong. I saw so many posts about premature babies, placental abruptions, babies born sleeping. I had to convince myself that it wasn’t a coincidence we conceived the month we were due and that I needed to trust God. Now that my son is here, it seems like all these posts about mothers losing their babies to SIDS has started to follow me and haunt me. No matter how much research I do, it still terrifies me to think i could lose my son and have no reason at all. That I could have a perfectly healthy pregnancy and a perfectly healthy baby and still lose him. I’m so scared, I’m so anxious. He’s supposed to be in a crib with a hard mattress and fitted sheets and nothing else but parents still lose their babies this way too. I’ve been “cosleeping” in hopes that he’s never far away from me and I’ll be able to tell any change in him right away. We don’t share the bed, I don’t want to crush or accidentally suffocate him, I just hold him while he sleeps. Has anyone ever had this awful fear and gotten past it? I just want to feel at peace.