hi I m 17, I have been having quiet a lot of problems lately let me list them. It started at the end of 2012, I started to get really fatigue and weak and eventually my legs started buckling, I was limping. I still have this problem but its slightly better. I had lost a lot of weight within those days since I had low appetite. I also developed back pain which was severe so I consulted a doctor and it seemed like my spine has a bulge (mild scoliosis). and I noticed that when I exercise my legs starts to get weaker and the back pain arises as soon as I do hard work or run. also I get this chest pain when I exercise until I get tired it is really bothering me and I get this weird headaches every now and then, It lasted a week recently and moreover I notice I forget little things easily and it takes me time to remember them unlike before where i remember almost everything. I also feel dizzy and recently I fell down once I stood up from lying position, I often happen to feel dizzy whenever I stand up from sitting or lying position, and its because of low blood count? I have been trying to put on weight but it s quiet hard and I cannot exercise for much long due to my legs and chest pain, I had consulted a lot of doctors regarding this matter but they don t seem to figure out why exactly I m having these problems, please help me.