Hello! Thank you for asking on HCM! I read your question carefully and understand your concern. Your symptoms may be related to low blood pressure or low intracranial pressure. You should know that from the heat in jacuzzi the blood supply to the skin is increased, leading to a slight decrease in other organs, and a low blood pressure. After cesarean, due to the spinal block, the tearing of the meninges in the place of the spinal tap, could cause chronic leakage of the spinal fluid, leading to headache and nausea that are relieved by laying down. A decrease in the blood flow, could exacerbate low intracranial pressure. I recommend consulting with your GP for a careful physical examination, a head up tilt test and some routine lab tests (complete blood count, thyroid hormone levels, fasting glucose, blood electrolytes). A brain MRI and a spinal tap may be necessary to exclude the above disorders. Hope to have been helpful! Greetings! Dr. Iliri