hi, my name is xxxxx and im 21 years old. i have never had a migraine/ or severe headache really in my life. this past week, after brushing my tongue a little too far back, i gagged and my head suddenly starting throbbing and it felt like it was going to explode. Then, after a few minutes of that, the pain went to the back of my head and neck . what could be causing this and should i be worried?