Does is right that stress can cause gbm brain tumor im in high stress and anxiety from 3 years constant now i have symptoms im worry ?

Not related: Gbm is not caused by stress. If it were, gbm would be a lot more common than it is. Chronic stress, or reactions to it, can cause or be associated with a bunch of other health issues. Learn to destress, preferably without meds, or drugs like alcohol, pot, etc.

No: Stress, by itself, has not been suspected of causing gbm. Thankfully, since there is plenty of stress out there! current research indicates that formation of these tumors is due to a combination of genetic factors, environmental factors, and random mutation.

No: We do not know the etiology of gbms. It is believed to be a series of mutations that affect certain growth factors that are still being defined. There is no data-experimental or epidemiological-that has demonstrated a relationship between stress and the development of gbms.