Most of the above such as "What is the worst thing that can happen?" and "There is not reason to be scared." are the worst. Like I get it that those people are probably trying to help, but it's not really helping and it just makes us feel like our fear is irrational.
But another thing I really hate is when my mum comes and says "I'm not even gonna tell you that I feel sick because I know what you're like." Like umm... mum, you just told me. She knows I'm slightly hypochondriac yes she can never help it and tell things like this to me.