Yes, you're right Evaluna, our minds are such amazing and terrible things. They really are.

I can only speculate but perhaps your self esteem has taken a knock, perhaps due to the crohns, idk, which has lead to a kind of depression - and from there lead into the paranoid thoughts? I'm only suggesting that because in my own experience when I'm feeling low for whatever reasons, yes, the inner negativities have a tendency to build on themselves. I try to use distractions and mindfulness to counter that now, but still, those thought processes are there. For me.

Anyway, hang in there, stay strong, and there's a good chance it will pass completely in time.