Do i have an eating disorder?

im 19 and am a meter nd 43 cm tall, i way 41 kgs... is there anything wrong with this? ppl keep sayin im underwieght nd anorexic. I only eat one meal a day and exercise for about 4-5 hrs in the morning and again in the afternoon. im always tired, fainting and find myself sick with colds and flu. is every1 right is there something wrong wif me.... ???? plz help me