The milkshake idea is good. I think in general, increasing the amount of fat and protein in your diet (preferably unsaturated fat and lean protein), portion size, and carbohydrates, you will easily put on weight/bulk up. Unless you have some kind of underlying thyroid issue, I don't see why milkshakes and a larger diet wouldn't help you out. I doubt you are suffering from malnutrition, but if you are, remember it's important to see a doctor/nutritionist to see what your nutritional deficits are. Good Luck!
Also, try doing strength training exercise to build muscle; this will make you gain weight and look bigger. (rather, you will gain weight so long as you are eating enough calories to be expended)
hi i used one tab before bedd every night called periactin its an antihistamine u can get it from ur gp, i was very unhappy for years weighting in at 6 stone bmi at 14.5 started taking periactin then WOW 3 and a half stone i put on within 6 months. i used to eat loads before i started takin them but didnt seem to put weight on untill i started taking these good luck :)
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