I am really worried, i am a 17 year old girl but for the last year ive had swollen glands, i have had 4 full blood counts through the year and all came back clear, but lately i have had really bad headaches and dizziness feel sick no apetite and tiredness could this be lymphoma or would the blood have picked something up p.s. i am a hypochondriac as i thought i had appendicitis , a brain tumour , and was having a heart attack