It always takes more time for the blood to reach the head on a fast because everything has slowed down, including the rate of the heart beat, so blood pressure probably has dropped as well. If you stand up very quickly you may faint. I repetitively instruct all of my clients to stand up very slowly, moving from a lying to a sitting position, pausing there for ten or twenty seconds, and then rising slowly from a sitting to a standing position. They are told that at the first sign of dizziness they must immediately put their head between their knees so that the head is lower than the heart, or squat/sit down on the floor, I once had a faster who forgot to obey my frequent warnings. About two weeks into a long fast, she got up rapidly from the toilet and felt dizzy. The obvious thing to do was to sit back down on the toilet or lie down on the bath rug on the floor, but no, she decided that because she was dizzy she should rush back to her bed in the adjoining room. She made it as far as the bathroom door and fainted, out cold, putting a deep grove into the drywall with her pretty nose on the way down. We then had to make an unscheduled visit to a nose specialist, who calmly put a tape-wrapped spoon inside her bent-over nose and pried it back to dead center. This was not much fun for either of us; it is well worthwhile preventing such complications. Other common complaints during the fast include coldness, due to low blood sugar as well as a consequence of weight loss and slowed circulation due to lessened physical activity. People also dislike inactivity which seems excruciatingly boring, and some are upset by weight loss itself. Coldness is best handled with lots of clothes, bedding, hot water bottles or hot pads, and warm baths. Great Oaks School of Health was in Oregon, where the endlessly rainy winters are chilly and the concrete building never seemed to get really warm. I used to dream of moving my fasters to a tropical climate where I could also get the best, ripest fruits to wean them back on to food. If the fast goes on for more than a week or ten days, many people complain of back discomfort, usually caused by over-worked kidneys. This passes. Hot baths or hot water bottles provide some relief. Drinking more fluids may also help a bit. Nausea is fairly common too, due to toxic discharges from the gall bladder. Drinking lots of water or herbal tea dilutes toxic bile in the stomach and makes it more tolerable.