Why do i always get a headache/migraine in the same spot?

Not unique: Migraines can cause hemicranial problems, that is one sided, and not unique for pattern to be repetitive, and chronic. Do not worry, unlikely to be focal tumor. On occasion triggering may occur focally, from jaw, dental issues, sinus problems, cervical discs, or thoracic outlet syndrome, so may be worthwhile to search for one of these.