I've been T1D for 33 years and received a gastroparesis (GP) diagnosis in year 28. My primary symptoms have been diarrhea and feeling bloated after eating. I have not noticed, to any significant extent, any changes or delays to my post-meal blood glucose traces. I use a CGM.
When I received my GP diagnosis back in 2012 I made radical changes in my diabetes routine. I knew that keeping my glucose levels in a better range was the only thing I could do to enhance my odds of keeping GP from progressing. I started eating lower carb at less than 100 grams per day. I began walking two to five miles every day. Uploading my CGM data to a website for analysis became something I did several times per week.
My BG control markedly improved. My time in range moved up to 80%-90%. My basal rates dropped and so did my meal insulin doses. I ended up reducing my total daily dose of insulin to half my former usage. I felt better, too.
While my GP symptoms did improve marginally, they did not get any worse. It's been five years now since my GP diagnosis. I think my better control of BGs is responsible for that. I'm lucky to not feel the more extreme GP symptoms and my heart goes out to those who must live with more severe symptoms of this diabetes complication.
It's never too late to reach for better glucose control. It will give you the best chance for better health. It's one of the few things within our grasp to reasonably respond to diabetes complications. I wish you the best.