Extreme nausea and slight vomiting

Hi so this Prep has made me really nauseous and my stomach is just hurting so much it’s 4am and I gotta be up at 7am but my stomach is just turning.

I’m trying my best to keep it down I’ve only vomited just a bit up. I still gotta do a whole other 1 litre of prep. Any tips to Try keep it down ?

Update : Spoke to a nurse got told to start 2nd prep hour earlier and just take it slow and see how that goes ughhhh