I need help with my anxiety. i keep feeling light headed all the time, and i keep worrying it's a brain tumour. i've had all this for 5 years now....

Combination approach: I'm guessing that you've already seen your primary care doctor for health evaluation and any diagnostic testing needed. It's very common to feel "light headed" or dizzy when anxious. Rapid breathing and other physical symptoms often accompany this. Please consider seeing a psychologist or other professional psychotherapist for tools to deal with your anxiety. Meds will be only a partial help.

Therapy?: Have you yet tried any form of psychotherapy? Typically, the optimal combination of things to treat emotional issues such as depression is medication (which, on your best day, is supposed to take the edge off symptoms) but the real gruntwork takes place in psychotherapist's consulting room.