Hi
I understand your fears, I have the same fears too. But, don't let them stop you from enjoying your kids and your life. They'll likely be just fine, but on the off chance they ever suffer a mental health problem, at least they know they have a lovely caring mummy to go to for help and advice because you'll understand them.
If you feel you're struggling at the moment, it may well be hormones. With my last two babies my mental health really took a nosedive and anxiety went through the roof. Don't be afraid to ask for help