Hi there, i have a pressure right on top of my head, for about 3 days now. it started with headache behind the eyes. should i be concerned?

See a neurologist: These symptoms may represent a specific kind of headache or other neurological condition. You should keep a log of the location, timing, duration, characteristic, and intensity of these episodes and take the log with you to a neurologist. https://www.aan.com/Guidelines/Home/ByTopic?topicId=16 , http://emedicine.medscape.com/article/1142731-overview