I don't have a definitive answer but here's what I do. I stop singing for a while (maybe a day). Get plenty of rest. Then warm up on easy excercises being careful not to strain. I might take a walk and try to get the diaphragmatic breathing muscles active and work on speak-singing on them. Echinacea helps sometimes. Then, on a gig, I deliberately not yell or strain in any way. I use a mic if I need to or just relax and speak-sing without shouting. When the breathing muscles take over, then the voice returns. The right amount of air goes through the cords which approximate to accomodate it.

I'd stay away from alcohol because it might have the effect of drying up the cords and although you'd feel less inhibited, you might do some damage. Good physical health and good singing go together.

Swimming can sometimes help or light jogging or fast walking to stimulate breathing. Kundalini Yoga can sometimes help as well. (Prahna breathing).

The main think is to coax not force the voice back.

Frank Hamilton