*hugs* I am sorry you are going through such a tough time. Think of it this way, if your husband had a real fear of blood and fainted anytime he saw it would it make sense for him to take care of your son when he grazes his knee or something. No probably not. Your phobia is no less valid than that. You are not a horrible mum. My aunt can't deal with my cousins runny nose and he knows that he has to wipe it or go to his dad, thats how it is. That doesn't damage him it's just how it is LOL You are there for your son in so many other ways that will really count. Hope you and your son feel better soon.
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Be courageous, believe in yourself, and be the best woman you can be. I'm with you all the way.