Convinced I have Leukemia

for some time now ive had a bruise on my leg right on the bone it forsnt bother me when i dont think about it or touch it and then when i know its there it scares the day light out of me because i recently read a story about a girl who died of leukemia she had bruising on her legs that didnt hurt and she died shortly after,now this bruise hurts me it hasnt changed in size or colour or anything its stayed the same but every time i touch it it hurts i start messing with it and then i cant leave it alone so it starts hurting my leg i dont know if its all in my head but i think im always getting a dead leg i suffer from health anxiety so bad i always think im dying of something different everyday. but ive lost alot of weight recently but ive put that down due to stress but what if im really dying i dont know what to do anymore