everything goes black and dizzy when I stand up or something. that happens a lot in one day, probably 5times. Ive been experiencing that since I was like 7 years old. Now im 13 yrs old. Once i fell down because of it. now, im experiencing other sympoms other than that. ive had fever a month ago which lasted for a week. i had lots of tiny red spots near my jawline and few in my legs when i had the fever. after my fever subsided, the tiny red spots slowly faded away. now, i feel like gettin sick again. slowly, the tiny red spots are growing in my right arms, legs and chest but only few. there's a non visible painless bump in the right side of my neck. Im suspecting cancer because of the bump. Im always tired, im very very pale. (everyone keep on saying that.)I find it hard to breath when i'm walking. many times, i woke up with shortness of breath and rapid heartbeat. sometimes i feel pain (pinching) and burning in the right side of my chest which lasts for about 5 minutes. i experienced wrist pain a week ago too, and my buttocks or idk. lol feel like im old like having an arthritis lol. i have a bipolar appetite. My height is 5'4 and weight is 35 kg, im 13 yrs old. what will happen if i don't take care of my health? Is this life threatening?