Hi Carole,
There are at least 7 or 8 types of microscopic colitis known at the present time, and the list continues to grow each year, (most doctors are only aware of the 2 most common forms, collagenous colitis, and lymphocytic colitis). Some patients have the markers of both CC and LC, and so their form is often referred to as simply, MC, (however, remember that all forms of this disease can correctly be referred to as MC). Some of the less common forms are clear cell MC, giant cell MC, paucicellular LC, cryptal lymphocytic coloproctitis, Paneth cell hyperplasia, and a type known as "not otherwise specified", (

).
Many of us have small intestinal damage, also caused by the disease, and in that situation, the villi of the small intestine are damaged, (similar to celiac disease), and fat is malabsorbed, and it passes out with the stool. Since most vitamins are fat soluble, they are also poorly absorbed, and pass through with the fat, to a great extent. IOW, if you have a malabsorption issue, you may need to take supplemental vitamins, and you may need to use a sublingual form, (designed to dissolve under the tongue), of vitamin B-12 and folic acid, in order to avoid anemia, and other deficiency issues.
The gas and bloating are almost surely caused by gluten, (unless you are consuming dairy products- they can cause it also), and the x-rays will simply show that your intestines are inflated with gas. (What else could it be?) I realize that he has determined that you are not a celiac, but that does not mean that you are not gluten-sensitive, (of course, most GI docs don't even realize that non-celiac gluten sensitivity exists).
MC does affect the functioning of the pancreas, but I'm not sure that taking a pancreatic enzyme will be effective for reducing the gas and bloating. When I tried digestive enzymes, they just made me sick as a dog, (world-class nausea and vomiting), but, of course, YMMV.
Tex