I have had a headache every day for over a year. Been diagnosed with severe sleep apnea, chronic hives, chronic headache and anxiety. I feel these are all effects of what is really wrong. I have a cycle of headaches where symptoms are worse for 4-5 days and include dizziness, nervousness, body temperature warm, blurry vision, food allergies and insomnia. Then another 4-5 days where the symptoms are less but still there and then 9-10 days of just the headache. What kind of specialist should I see?