I sometimes want to get rid of the things that make me happy
Why do you want to get rid of things that make you happy?
I feel they might make me sick.
It's not a healthy mindset to think that things that make you happy will make you sick.
I can't help but to think that way.
I think you may be going something that's causing problems with your mental health. I would recommend you seek professional help and they could help resolve this odd issue that you're having.