Re: How to not worry?
I think the only thing that will help is time. And over time, when you see that this baby isn't having the same issues your other baby had, then you'll relax and it won't be an automatic panic response every single time something little happens.
You're mind is set to hyper-vigilance and it's going to take a while for it to reset to normal.
I don't have your exact issues, but similar ones from caring for a kid who needs constant monitoring. It's all I can do sometimes not to grab at other people's children to restrain them the way I do with my son. It's become instinct for me. But one that I'm learning to repress as my little man grows up and needs less.
“We are not put on earth for ourselves, but are placed here for each other. If you are there always for others, then in time of need, someone will be there for you.”