Well, having not gone through anythng even remotely close to this, I will now give my opinion. Take it for what it's worth...
You've already decided you don't want to marry her and you're looking for some kind of validation from this group. Is it unfair to call-off the wedding because of a medical condition that's beyond her control? Maybe... Is it unfair to marry someone you don't want to marry? Yes. If you don't want to go through with it, you shouldn't, for both your sakes.
In answer to your question, "Is this normal?" The answer is irrelevant. Whether it's normal or not, this is how you feel, and you can't ignore that. You are doing no one any favours by marrying someone you don't want to marry.
Good luck!
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