Im going to turn obese if I don't stop eating ugh?

Should I not worry about what I am eating since I lost my period for a year? Im 16, 5"5.5 and 110 pounds I used to be 100 pounda and want to be that weight again and o don't care I'd I'm underweight....should igo for it or should I just eat whatever I want? This whole week I have been eating very crappy...chops, chocolate, icecream ugh....I feel miserably guilty ..I don't want to become overweight!!! Please tell me I'm going to be okay!!