The whiskey helps numb the throat. Depending on your Mom's portions, it really isn't a bourbon taste.
Have you tried he cloroseptic spray? It really does help numb, but can turn your stomach if you get too much. Anything warm seems to help ad the salt water gargle is good. BrownEyedGirl's advice is as good as you're gonna get.
If you get high fever, go to a clinic and at least get a throat culture. You don't want to be penny wise but pound foolish!
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