Have you spoken to the health visitor or gp? This sounds like a lot to be handling on your own, what have your family said? What it sounds to me is happening if your brain is doing a lot if risk assessment and more than it needs to, try thanking it but letting it go, I know that's easier said than done, make sure that you acnolege the feelings are temporary and not permanent, you are worried in this moment not forever, remind yourself that you are safe and not alone. Speak to a professional, you got this mama
This is OCD, I have it and it is relentless! Especially after childbirth it can get worse. Contact your GP if you think medication might be a good option for you and also try to see a therapist who can help you tackle it. There are also natural supplements that should help take off some anxiety but discuss it all with GP! You’re very proactive to reach out and get help, I’ll be praying things get better for you soon xx