you need to increase your calorie intake to gain weight mate. Eat more food!!!! Lots of it, and lots of chicken, but not junk! dont worry in the summer before i went on holiday i was just over 10 stone, on holiday i ate soo much food on all incusive buffet i ran every morning so my belly didnt stick out, in that 2 weeks i went to 8 stone:|, i just got back to my regular eating patterns, eating lots of food, 5 meals a day, high calorie intake, lots of carbs and protein, 40%carbs 40%protein and 20%fats. Now im around 10 stone again, well about a week ago when i checked i think i was 140 lbs so lightweight againt or junior welterweight or something i forget. Just eat big, but healthily. The thnings on your eyes, try and sleep in a more regular pattern, get your circadium rhythm to adjust to your needs init. Which reminds me i got to go bed now because i have to wake up at 7 to fight my sisters for the bathroom. Ye you want around 8 hrs sleep minimum too.