I have had a headache for almost a week now. It mainly felt like pressure, but today it actually hurts. Like a sharp pain in different areas. I've checked my Blood Pressure several times and it is normal. I drink plenty of water as well. It all started after I started myself on a strict diet and exercise routine. I skipped two days of exrcise thinking I was overdoing it and possibly dehydrated. It still persisted. Yesterday, I decided to go to the gym anyway and did a mild cardio workout (walked a mile, ran a mile) and the pressure headache went away. Today, I haven't been to the gym yet and my head is killing me.