Hi,
You are suffering from tension headache precipitated by stress.Did you take any medication to relieve the pain? I would also suggest you to get your blood pressure checked. When the blood pressure shoots up it can cause a headache and a hot feeling.Please consult your physician if the pain does not go away. Meanwhile you can try OTC painkillers but please do get your BP checked.
What have you eaten lately? Go back 72 hours. Then go to www.truthinlabeling.org and read about MSG. There is a list of reations you can check on and also see where MSG is hidden. Remember reactions are dose related. Everyone is different.