Have any of you did some work for yourself, others and job until you didn't realize that you are sick especially dehydration that made you sore throat?

Actually, i am having it now and i wanna reduce it just a little because nearing this weekend I'm gonna be at my sister's wedding plus the bridesmaid is me and i dont want my sister to notice that I'm sick so...if any of you guys can give me tips on how to reduce it I'm gladly appreciated X3