Okay I am really hoping someone answers this because I'm starting to get really worried. For the past two or three years, I have had random head rushes. They are extremely hard to describe, but I will try my best. It is usually when I stand up (and no it isn't from how fast I stand. I have started standing up extremely slowly but it still happens), and my head suddenly feels very light, my vision starts to get all black and fuzzy, my head starts to throb and get really hot, and I feel very dizzy. Most of the time they only last about 5 seconds, but I have had times where they last almost a minute. They happen quite often and I am very scared for my health. I have never actually passed out from one, but I have fallen a couple times. Once I fell against a counter during one of them and one of my family members was in the room. They said that they had called my name multiple times, but I have no recollection of them doing so. They also said I was twitching, almost like I was trying to stand back up, but couldn't. The thought of anything like that happening again scares me, so please tell me what it is that could be happening, and if I should see a doctor for it. Thank you.