It sounds incredibly depressing, but I just want to know if this happens to anyone else.

Whenever I feel really good about something, I have things to be happy about, I feel inspired or just generally really good, I suddenly experience an overwhelming amount of anxiety fearing that it's not going to last. I'll feel so good for a moment and then think "what if I die tomorrow?" "what if the world ends?" 

My brain convinces itself that these paranoid anxious thoughts are prophetic somehow, and that just makes me feel worse and spiral. There's times where I can't even enjoy my day to day life because I've convinced myself it's all going to end somehow. And this is because my life is good at the moment! 

I have horrible health anxiety, occasionally suffer panic attacks, and have a lot of OCD symptoms, so this is probably all related somehow.