I think you need to talk to your dr about maybe imodium to slow things down. Also, increase your sodium intake to help you retain some of the fluids. Do you like oatmeal? A small bowl of oatmeal might thicken up and slow output. or part of a ripe banana or a baked potatoe with salt. Just some ideas.... I know you feel nauseous, but the nausea may also be from lack of food and dehydration combined.
Don't let your symptoms go too long. You need the fluids/electrolytes. Talk to the dr/surgeon about a RX intervention to slow things down until you can get them under control would be my suggestion.
Stay in touch. Good luck to you.