Repeat GES approaching

I'm in Scotland and had a delayed GES 2.5 years ago but I've been fighting for treatment and for them to actually diagnose/believe me. Gastro doctor said I dont have GP my results were only delayed from lack of eating. Like excuse me I used to eat well and was borderline overweight and only stopped because I got sick all of a sudden any time I ate??

Anyway. They're making me repeat my GES in 2 weeks, I was told I'd be allowed weetabix but they've now said I have to do cornflakes again. I haven't had solid food pretty much since my last GES because I can't keep it down - I've been tube fed for over 2 years.

What can I do to make this experience easier?

Also they've told me to continue my metoclopramide and anti sickness when last time I was told to stop 3 days before?

Advice and kind words appreciated, I'm severely unwell and struggling a lot.