Systematic Candida Diet for someone thats 92 ibs?

My mom thinks i have this, and she's going to this health store, and this lady " had" all my symptoms which are really bad. So, this lady is making my mom buy all this healthy medicine that is really expensive, & doesn't have sugar at all, and it's nasty. My mom is making me eat really really healthy If something have 1g of sugar she freaks out and goes all mad on me. People/doctors already call me anorexic, i eat a lot and don't gain weight. Is this going to make me lose weight?. cause if it is i'm going to be mad cause i hardly fit 0's cause they're to big. i'm 15 btw.