Distinguish head pressure from headache, and how to treat the former. thank you.?

Not sure: What you are precisely talking about. Do you feel pressure in your head, or have you been diagnosed with high intracranial pressures? A sensation of pressure often comes from chronic sinusitis, either infectious, allergic, or post-infectious, these can be treated with saline rinses, nasal steroids, and antihistamines and/or antibiotics depending on the cause. See a physician to get a diagnosis.

Pressure in headache: Headache pain can take on all forms, including pressure. The best all-around tip for diagnosing headache types is a headache diary. This includes the timing and severity of your headaches, what you were doing prior to, etc. Also important is what you do for them and whether it works. Here's a helpful link to get you started. http://www.headaches.org/for_professionals/headache_diary.