Hi @papo and @anitannapa, Welcome to Connect. Thanks for sharing how you were diagnosed @anitannapa. I thought I would share a link with more information on the different methods used to do the gastric emptying test. Here's some information I found that describes the test.
-- Gastric Emptying Study: What It Is, Prep, Procedures & ...
https://my.clevelandclinic.org/health/diagnostics/gastric-emptying-study
I'm not sure if it's an option for either of you but Mayo Clinic does have a Motility Clinic. Here's a link - https://www.mayoclinic.org/departments-centers/motility-clinic/overview/ovc-20357787.