question: Hi, Sometimes at night I wake up to go to the toilet (urine only), and feel slightly nauseous. By the time I get to the toilet I feel very nauseous, hot and thirsty, and if I don t quickly lie down on the floor I will faint. Often I have to lie on the floor for more than 15 minutes before I can try to get back to bed (although the cold tiles helps with the hot feeling). I can t even sit up to get a drink despite the extreme thirst. Even when I feel I can get up and get back to bed the dizziness and nausea quickly return and I only just make it back to bed before fainting - although the other night I fainted before I got back to bed. Even when I get back to bed I will feel nauseous and hot for up to an hour. These episodes happen possibly only every 6 months, but have been happening for several years now. I am 40 years old, healthy weight, and I exercise regularly.