I have a very similar situation. ( you can look at my posts). But, in short - to aleviate the nausea at the time of shot I take Zofran ( ondansentron) right before the shot. Never eat before, and eat crackers and swiss cheese the day of the injection.
I also take Creon with all my meals! That has helped a lot! Diet is very important with pNETs - no tomatoes, watermelon, pineapple, aged cheeses, alcohol, low fiber diet (no whole grain). The good news is that with time the symptoms after injection lessen! (I have been on Lanreotide since March 2023). Good luck! Have faith! This is treated more like a chronic disease!💜🦓