Wow, I really hope you're exagerating...
Are the flies making they're way inside from out, or are they breeding inside?
If you're not exagerating (/me cringes) take a vacum cleaner to those sob's right now, and take the bag far far away from your home.
After you have them down to a manageable level that way, I'd say to just take a fly swatter and go commando on them. Take a day off and do it all day. Then make sure your house is sealed, and watch like a hawk for new, little flies.
I don't really know the best course of action here, but that's probably what I would try.
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" ' Big Mouth.
Remember it took three of you to kill me.
A god, a boy, and, last and least, a hero.' "
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