For months now I have had severe knee and joint pain, I have trouble sleeping sometimes and others I sleep all the time (about 16 hours a day), my appetite has changed, I have gained weight, I get bloody noses, I am no longer as in shape as I used to be because exercising is too hard and makes it difficult to breathe, and my temperature changes often (either i’m really hot or I’m freezing). I don’t get sick that often, but when I do I’m sick for months and nothing seems to help, I just have to wait it out and hope it passes. Is there something wrong?

If it helps at all,
I’m a female,
I’m 15 years old,
cancer runs heavily in my family,
and my parents both have Lyme Disease (although I lost my dad to it over 10 years ago.) Can anyone help?