Girls, hello. My son has a rash on one cheek. I suspect it's due to al…

Girls, hello. My son has a rash on one cheek. I suspect it's due to allergies, of course, I want to give up sweets altogether, but if we don't eat one cookie a day, my head starts spinning and I might faint. Maybe it's because of low blood sugar, I don't know. Anyway, do you have any suggestions for what can replace sweets?