How to know the reason for tiredness and sick feeling?

Hi doctor,

I am an 18 year old girl. I have been feeling very weak and tired. I am not getting sleep during the night and so I sleep throughout the day and wake up in the evening. I smoke and drink. Last weekend, I felt horribly sick after drinking. I get major headaches at times on the right side of the corner of my head. I have completely reduced smoking as I feel nauseous after I smoke. I got typhoid and dengue before seven months. I had jaundice 4 years back and since then I get pain in my stomach if I dance or run. I want to get healthier. My weight is 44 kg and my face has literally gone including dark circles. My eating habits are pretty bad and I eat after long hours. I really want to get healthy and look better. I want to have stamina as I have become very weak. I used to workout at the gym, but I would feel sick all the time during that phase. Please guide me. And yes, I go through horrible pain during my periods and I go through bad PMS phase. Thank you.

Thank you doctor,

I will upload the details as soon as possible. Regarding weight, I have always been very thin and not able to gain weight. When I got my platelets checked recently, they were back to normal. There have been times where I have been sick and my tests have been completely clear. I have always been a weak child. I will get back to you with the reports.