Anyone experience gastroparesis post esophogectomy?

I'm almost 4 months post esophogectomy and currently getting bimonthly Optdivo infusions. About 10 days ago, I started having significant dysphagia and associated pain after eating. Prior to that, I was doing really well and eating small, frequent meals without issue. Now, I get severe pressure and pain even after a small amount of food or drink. I lost 8 lbs in a week after holding steady for 3 months. I went to Mayo and they did a Barium swallow test and didn't see any strictures so the thought is that I have gastroparesis. My question is, has anyone experienced this after feeling fine for months? Was it induced by the esophogectomy, immunotherapy or both? I'm trying to get with my local GI doctor and oncologist to see if they can help. Last evening, I had to go into the emergency room to receive IV fluids due to malnutrition and dehydrarion. I can't even tolerate Ensure or other meal replacement without pain and having to relieve myself via self induced vomiting. Let me know please?