Alka-seltzeer is a tabletized mini-potion marketed by wizards to muggles... It has to be. It certainly tastes bad enough to be one of Snape's potions. But it works! And very quickly at that.
That just-sick-enough-to-be-uncomfortable feeling can somethings be worse... you're never steady enough to feel fine, but not sick enough to just be *sick.*
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*hugs*
Hope you're feeling better.