Does anyone know if gastroparesis is progressive over time?

i was diagnosed with gastroparesis about 3 years ago (gastric emptying study). I had it several years prior, however, just went undiagnosed and YEARS ago was unable to eat fibrous vegetables things like broccolli etc. it would just "sit" and come back up hours later - totally undigested. I am managing it by dramatically changing my lifestyle both when and what i eat. Currently I am unable to eat anything solid after 2 pm. if i want to be able to lay down and sleep around 9-10 p.m. Lately things seem to be getting worse and there are some days where i ONLY eat pureed things/smoothies, frozen yogurt and nothing solid - otherwise i feel nauseous all the time. I was wondering if this is what happens - that things get worse and worse until eventually you cannot eat any solids at all and perhaps even have to get a feeding tube put in?? Seems like the gastroenterologists i have seen know "next to nothing" about this condition. One told me "you can just drink Ensure" - like it was no big deal to drink Ensure the rest of your life!!