When I went in for my EoE scope, I was told, just be sure to take the PPI (Prilosec) for 3 weeks straight. No need to change my diet unless something actually caused food impaction. When I went in, they asked about allergies to peanut and soy, and since I'm allergic to both, they gave me a medication that contained neither. I remember nothing of the appointment after they gave me the sedative. My throat was sore for a couple weeks after, and I had a liquid only diet for seversl days after since the biopsy spots need to not get food stuck inside them before they heal.
The actual scope was non traumatic. Finding food I could safely eat after was far more of an inconvenience, but only an inconvenience.