Interestingly the one time I don't really get potsie is in water. Pools always feel great to me. The gravity and pressure just feel like they disappear. If my heart rate does ever go up I have a waterproof smartwatch. Highly recommended if swimming is something you do often. It can warn you when it begins to climb and then putting yourself in a horizontal position near the side of the pool can help. I would recommend to have someone with you when in the pool to be safe.