Hi welcome to hcm.
Since u alredy had mild cough
before friday it seem that u had viral infection .
because of smoking
,drinking and singing loudly u have strained ur vocal cord and with superadded viral infection ur throat is numb.
i would suggest u to quit smoking and drinking as these can aggravate ur problems and can lead to other medical problems.
take rest ,plenty of fluids in diet, any cough syrup like bro-zedex 2 teaspoonful 2-3 times per day,warm saline gargle 3-4 times a day.
if problem still persist get ur self examined by family physician and for further management.
hope solved ur querey.