I have been having these weird headaches, I will sit down and i will feel this pain coming on and it gets so intense my eye starts to water, it lasts for about 15 minutes, then goes away, then it happens again a little later over and over again all day, and sometimes it lasts longer, it is very intense pain, but i am also 35 weeks pregnant, so by the time i take some medicine the headache is gone. What is this? Someone said they are cluster headaches?? ( i have no idea what that is) Anyone else get this?