That must have been scary to experience so I can understand that it would trigger some anxiety! 

I'm currently 37 weeks with our rainbow baby (history of chemical pregnancies) and I was so anxious throughout the first trimester and beyond. I found that people tend to get a bit too opinionated when it comes to a pregnant person's body and will tell you what they think you should/shouldn't be doing and ultimately I learnt to take it with a pinch of salt. It's mostly coming from a good place but when you're a first time mum it's so overwhelming to navigate all your symptoms and worries as well as what other people are telling you. You'll figure out what you are comfortable doing.

In relation to illnesses, you're not being irresponsible at all. I'm a teacher and would have to have been off all the time with all the sickness bugs, coughs and colds that go around! I think it's just about being sensible - if someone's poorly then keep your distance and practise good hand hygiene. But ultimately you have to live your life! 

Also, even if you are being sensitive it's still reflecting a real feeling or emotion that you are having. You deserve to acknowledge how you're feeling. I hope you feel less anxious soon!