Hi... No I don't think you are having a brain tumour
. You may be facing symptoms of tension headache
syndrome. These headaches
you are facing may be involved with the stress
you are facing in your occupations. You need modifications in life style and may have to modify the working environment by making few changes in how you work.. With these changes you may find some improvement. It they are not helping in giving you relief, then you need professional help and medications to help control these headaches... Good luck...