My sister is 17 years Old, yesterday she felt a severe headache on one side of  her head(left side). The headache lasts for 5 mins,then goes away, but it comes back when she chews something or moves her head. When the headache goes away she feels hot flashes on face, tiredness and heavy head( left side only).She doesn't have any other symptoms like dizziness,fainting, vomiting, and weight loss. She is also suffering from anxiety disorder. What could it be