Hey, what causes a headache that doesn't go away especially during the day even after a meal and in the morning when i wake up... i don't sleep well and m always tired?

There are several: types of headaches, sinus headaches being one of them and tension being another. You won't know what you have going on until you see your doc. He/she can rule things out and identify what is happening and treat if needed. Consider biofeedback or clinical hypnosis (www.asch.net) as possible modalities to help. Peace and good health.