I have these "episodes" that no doctor seems to figure out. From time to time I feel an unexplained fatigue, its takes hard work to even move my arms, hard to keep my eyes opened, no energy at all. But if i try to sleep, i cant. I don't have even the energy to speak, and when i do, i cant find the words, the simplest ones, the everyday words....i refer to objects like "the thing that does that" or describe a fruit or anything very trivial, cause i cant recall its name...its terrifying. Its like everything is very slow in my brain, i feel really stupid, confused, lightheaded, cant focus, can barely work. It may not make any sense but the feeling in my head is that its submersed in a very dense matter... It's difficult to read, really weird sensation with my eyes, light fobia, i cant accommodate them, its like my sight gets "crossed" and back, and again, when i try to read or watch TV. When I get up everything turns black, for like five seconds or so, and my head pulses for the same time. My ears feel blocked, i can hear myself speaking from the inside. Sometimes i have headache, but not always, sometimes the vein on the side of my head pulses, and i can feel it by touching it. Last couple of times i noticed that the veins in my hand were very bulged, very different from what it normally is and it coincides with some allergic reaction.these episodes can last from a day or two to a week. On these days i can barely function, i miss exams, make mistakes at work, get very cranky, people must think i have a hangover. It really does affect my life in a very negative way. Sorry i cant explain better, I'm not a native English speaker, which makes it even harder to describe the symptoms. And sorry it's a long list, but if anyone can give me an insight on any thing related to how a feel, i would really appreciate it. Thanks so much. ah, I'm a 25 year woman, not overweight, have mitral valve prolapse. thanks again!