If its not pregnancy what is wrong? i have had a constant headache for the past month. i am constantly tired and have been sick for weeks now( feeling like im going to throw up). i haven't had a regular period since mid-december. in january i was late by

You : You need to be completely evaluated by a doctor. Having a headache for one month is very concerning and needs to be evaluated. Since your period is this late, you may need a blood pregnancy test which is more accurate than urine testing. Please be seen and evaluated. If you develop pain, fever, vomiting, or light-headedness then you would need to be seen as an emergency.