I'm 15 years old a have recently been ill. I have been having really bad stomach aches on and off and I just feel really tired all the time. I went to the doctors yesterday and they said I had a bloackage in my bowel and I have been put on antibiotics. But when I woke up this morning I found it really hard to breath. The breathing difficulties comes and goes. What is wrong with me? Do I have lung cancer? I'm reali scared please help me!