Welcome, im very sorry to hear about your struggle and i can relate to you trying to find a path forward i have struggled with gastroparesis for years myself . Ask your gastroenterologist about Domperidone. For me it has help greatly is very safe to use and has been around for years. Also as for your diet try this link.
https://www.livingwellwithgastroparesis.com/about
She has you tube videos, books and free diets menus withs a life of experience because she also has Gastropareses herself. Hope fully there is something in there to get you some answers best of luck to you.