I hate this feeling

Enjoy your vacation, your endo might be able to help with diabetic gastroparesis, but I don't know if they are up on celiac or gluten sensitivity. You might want to try a little bit of experimentation on your own. See if cutting wheat from your diet and see if it helps. If it doesn't then you're not celiac or sensitive, if it does then it could make you feel a whole lot better after eating. On a good note there are some fairly reasonable tasting gluten free pizzas and if you have cereal in the morning for breakfast have Kelloggs gluten free rice krispies, or Chex rice cereal. Good luck

There is a problem with stopping gluten entirely on your own. If they give you a test for Celiac, but your have not been eating gluten, the test will show negative whether or not you actually have Celiac. If it were me, I'd cut out pizza but keep eating a bit of wheat, etc., until you see your doctor. Then insist upon a test for Celiac. I'm not saying that you have it, only that it is common and you need some answers, and soon.

The problem with the celiac test is they make you eat gluten to prove you are sensitive to it or you have celiac. If you find you feel significantly better by cutting gluten out of your life then does it really matter if you can attach yet another label to an already labeled life ?

It's all a matter of individual choice, I guess. When I knew I had a digestion problem, I went on an elimination diet. It took a month, but I figured out that I couldn't eat gluten, soy, corn and some nuts. My doctors have accepted my conclusions. That was almost 20 years ago, happened at the same time that I was dx'd with Diabetes.

I have a friend who has Type 1, recently went to the doctor for allergy tests and found out very quickly and simply all the foods she has a problem with. I can't help but think she had a better method than I did!

I haven’t had pizza in 6 years now. Not worth the effort.

Pizza one of the things that I can't have at all

I agree with Jan. And it's supposedly more common for T1s. With gallbladder issues, meals high in fat can make the pain and nausea worse. When my gallbladder surgery got postponed for a month, the doctor told me to eat really really low-fat during that time to avoid flare-ups, and it did help quite a bit. Ate a lot of poached eggs..... As you're logging what makes you feel sick, keep an eye on the fat content.
Feel better soon!

An EGD is really the most definitive way of diagnosing for celiac. They can biopsy the upper portion of the small intestine where the damage is done when people have celiac. It's a quick test, you are sedated, and its over and done with in less than 15 minutes. No doubt about it if the biopsy comes back positive or negative. Like I posted earlier when the doctors THOUGHT I had Crohn's my blood tests were positive, but all my biopsies were negative. Biopsy is always the definitive diagnosis. I'd check with a gastroenterologist, they can check for both celiac AND gastroparesis. And you will have definitive diagnosis that way.

Not to harp on the gallbladder thing, but if painful symptoms are getting common for you, you should mention it to your doctor. Although gallbladder symptoms are usually on the right side, they can be on the center or left. (Mine was, so for months I was mistakenly being checked for heart or ulcer issues instead....)

Quick searches bring up info like:
"Symptoms of Gallbladder Inflammation (Acute Calculous and Acalculous Cholecystitis)
Between 1 - 3% of people with symptomatic gallstones develop inflammation in the gallbladder (acute cholecystitis), which occurs when stones or sludge block the duct. The symptoms are similar to those of biliary colic but are more persistent and severe. They include the following:
Pain in the upper right abdomen that is severe and constant, and may last for days. Pain frequently increases when drawing a breath.
Pain may also radiate to the back or occur under the shoulder blades, behind the breast bone, or on the left side.
About a third of patients have fever and chills.
Nausea and vomiting may occur.
Anyone who experiences such symptoms should seek medical attention. Acute cholecystitis can progress to gangrene or perforation of the gallbladder if left untreated. Infection develops in about 20% of acute cholecystitis, which increases the danger from this condition. People with diabetes are at particular risk for serious complications."

In any case, you probably should check in with your doc.... I hope you feel better soon!