I'm really really scared I'm going to have health problems?

I'm really really really really scared.

That one day I'll have cancer or something like that and then I'll have to give up my leg or arm or eye or boob.

D: I had a really weird dream about it and now I can't stop thinking about it. D,:

How do I try to make none of that happen to me
I'm really really scared I'm going to have health problems?
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