Always getting random pressure behind eyes, feels like my eyes are going to pop out. causing horrible headaches. why and what can i do?

Sinus possible: The ocular area is a common place to experience headache, and headache pain can be referred to the ocular area and behind the eyes, but is usually not caused by the eyes. There are sinuses all around the orbit, and sinus congestion or infection can cause a pressure sensation behind the eyes. Eyestrain, orbital inflammation, thyroid orbital disease, and ocular inflammation are possible eye causes.