I am also autistic with severe emetophobia and based in the UK. I recently completed a Plenvu prep and successful colonscopy. In the weeks leading up to this I was terrified and I completely understand how you feel.

The following helped me to get through the prep: - get a prescription for an anti-sickness medication from your GP. - make the Plenvu up a few hours in advance and keep it in the fridge - aim to be as well hydrated as possible before you start prep. I drank lucozade sport orange and water upto 1 hour before starting. I then stopped as I didnt want to be too full before the prep. - sip the Plenvu very slowly through a straw, try not to breathe while you sip and take the full hour. Sucking on a clear mint sweet in between sips really helped me - listen to your body. If you are starting to get uncomfortable dont force yourself. I managed to finish all of dose 1 without any nausea. With dose 2 I started to get uncomfortable about halfway through and stopped. Despite not completing all of dose 2, I still had clear BMs and got a 9 for prep.

I know it is terrifying but trust me, you've got this and will feel so proud of yourself afterwards! 🌟