So very sorry to hear of your loss. Loosing one;s parent is so hard.
I lost my mom five years ago at the age of 77. Looking back I firmly believe she was undiagnosed celiac. With Fibromyalgia, diabetes, unbearable excema (DH) on elbows and knees, bouts of constapation/diarrhea, vomiting and stomach cramps after meals, asmtha to mention just a fewof her issues - all of the classic signs of celiac. She also had weak lungs, had even had a surgery at one point. She did not habve lung clots, but her body just slowly shut down.
Three years after loosing mom I was finally diagnosed. Often dad will comment on one of Mom's sysmptoms and say how much alike we are. I now wonder how far back this disease went.....My mom's mom was diabetic & had asthma.... the cycle goes on.