is it just me?

Why is this phobia so hard to let go of? For example I’m starting to feel better now since switching meds. I don’t really worry about eternity as much as I used to, but when I’m not it’s like my brain gets scared/anxious because I’m not worrying about it. Like I can’t phantom not being afraid of eternity and it feels like the people who aren’t are the weird ones (even though deep down I know that’s not true). Has any one else dealt with this and if so were you able to overcome it?

update: thanks for the replies guys, it feels nice to know this is a common symptom and not just me being crazy