Can't say that I've ever had a gastric emptying study by condolences go out to any that have going by the apparent side affects.
I have found myself not really trusting doctors/medical facilities. Here are two examples of why...
1) When I lost the use of my right eye due to an injury while in the military they never detected that the injury had caused trauma induced glaucoma (high internal pressure within the eye). With today's procedures my sight in the eye could be restored except for the fact that that the glaucoma destroyed the optic nerve for that eye and there is nothing to correct this.
2) When I lived in Florida a good friend died of intestinal cancer; His doctor treated for ulcers for a year and a half.
May sound odd but I have what many call white coat syndrome. When I go for my yearly checkups at the local Veteran's Admin. my blood pressure is rather high. When not at such a facility my blood pressure is actually on the low side for my age.