I have headache bk left of head and get pressure behind left eye sum times blood shot what could it be I've had it for 2 months?

Sinuses . Most pain in or around an eye is from sinusitis or headache. Pain reliever and decongestant should relieve it. If not, or if it is getting worse, go see your doctor. It could also be due to an eye problem such an inflammation in (called uveitis) or around the eye. You need to see an eye doctor to really rule this out.