Pressure on both eyes and headache all over the head, 3 days, non-stop and still the same condition. what is it?

Need to see your phy: You need to see your physician. The headache could be a migraine, it can't be inflammation inside the head, sometimes it can even be problems with the neurologic system. This needs to be evaluated. It has lasted three days. And it's time to do this.

Head ache: head ache could've sinus related migraine like vascular headache sometimes intracranial lesions ions need to be ruled out. You need detailed exam see you pcp