Hi, I had gone through your question and understand your concerns. To my opinion you expierenced a sudden decrease of blood pressure or decrease in cerebral blood flow, which is affected by hot water. The reason is quite simple. While most of the blood is directed to the skin to make the thermoregulation in front of the change of temperature due to the hot water, there remains less blood to supply the brain, thus experiencing a faint like episode. If you had a meal before the bath, some blood goes to the digestive system, extracting from the necessary ammount to supply the brain. So dont worry. Dont eat before the bath. Consume enough liquids and take the bath to a lower temperature. Hope this answers your question. If you have additional questions or follow up questions then please do not hesitate in writing to us. I will be happy to answer your questions. Wishing you good health.