My Weight Has Decreased to 87.2kg.

My weight has decreased to about 87.2kg. But after taking Bilanor, the anti-allergic medication, the amount of decreasing has descended. My father recommended that I stop taking Bilanor. But if I don't take Bilanor, all of my skin will become itchy. On Tuesday, I'll go to the allergic hospital. I want my skin to become comfortable. My goal of my weight is 86.2kg. But today, I became careless, so I've taken two sandwiches, Famichiki, Monster, the energy drink. Tomorrow, will my weight increase again?