You are alive. And your prognosis, if I am to understand correctly, is overall good.
This Sunday marks the fourth anniversary of my wife's passing at just 46 years old. She had unending nausea, and major motility issues. They also thought gastroparesis at first, and her doctor and surgeon even developed a surgery just for her, which I understand they won awards for. It helped her for about 2 months, and she started regaining weight, but her symptoms- unable to hold down food of any kind- returned.
From there things just got worse. G-J tube feedings with formula. Then TPN, which her body also rejected. And then... the actual starving. Her body refused any sort of nutrition from any source, even directly into her bloodstream.
Doctors essentially gave up. She was on hospice for quite a while. She had started off as a large woman and when she passed, she weighed about 55lbs.
I tell you this not to scare you or make you worry, but to make sure you're grateful for the health you do have, OP.
They never did figure out what was wrong with her. Official cause of death was "malnutrition." Right. Gastrointestinal mysteries such as yours, and hers, really underline the fact that as much as medicine does know about the human body, there is an infinite more that they don't know about it.
Best of luck to you.