Try my favourite, hot lemon with honey & fresh ginger, allow to stand for a few minutes & sip slowly. Lots of voice rest, get yourself a writing pad for a few days, then go & find yourself a vocal coach & get some lessons on how to project your voice without straining. The vocal chords do wear out, & even though I could at one time belt out a song with the best of them, years of doing it, even with proper training takes it's toll.

Good luck

Aggie