Hi, Im A Girl Of 17..turning 18 Next Month And

Hi, im a girl of 17..turning 18 next month and im underweight...I weigh 41kg, i have always been small, most of my family members are short and curvy (most are women) and im jus short and skinny... I used to eat a LOT but still wouldnt gain, I just get belly fat while the rest of my body is skinny, a couple of weeks ago I had a fever or something and ever since then I have lost my appetite, I eat like once a day and drink lots of juice, soda and water throughout the day ,I think maybe its because of the exams ...I found out about Apetamin and I was wondering if it was ok for me to get it? I live in Africa, and it is quite expensive ...like P300, so I also wanted to ask if it can be covered by medical aid