I ve been taking Coumadin for the past 18 years, due to a pulmonary embolism at age 30. About 5 months ago, I started having pain behind my right eye (typically when I m stressed out at work).. About 3 months ago, I started to have eye twitching as well (not all the time). Some days it would be my right eye, other days it would be the left. More recently (past 3 weeks), when I go to bed... I have severe Vertigo.. almost to the point of getting sick. Is any of this related?