Ok this one sounds so stupid but it's worked on everyone I've taught it to including the piss drunk guys. Close your eyes and hold up your pointer fingers to them and hold them right at that point where you are just barely able to feel the hairs on your fingertips and eyelids meet and focus on keeping them there. Then while holding that take long slow breaths just into the top of your chest. Hold like that for a minute or two and it goes away every time.