Chronic tension headaches like pressure in back of head for 3+ days every few weeks. Sometimes dizziness but no nausea, vomiting or numbness. Causes?

Multiple factors: Stress, tension, ananxiety, insomnia. neck strain from extensive computer use, old injuriues , arthritis and both female hormonal or thyroid hormone issues, just for openers. Certainly,should be evaluated with a physical exam and testing.