Havng allergy and wheezing.difficult in breathng.i hv bcome slim.doctor say thts bcoz u don't gt enough oxygen..plzz wht cn i do?help im vry slim?

Need more info: It would be unusual for someone as young as yourself to have allergy and wheezing as the cause of being too thin, unless you have a lung disorder such as cystic fibrosis. Older patients with emphysema may have this difficulty but very unlikely to have this diagnosis at your age. You need to speak with your provider about looking for other causes, besides having a fast metabolism, for this issue.