Why can't I eat after total gastrectomy? Food feels stuck

This is a question to the overall community but first I want to provide some context. And please forgive me if it is a little long. I was diagnosed with Gastric Cancer April 2025 and also Iwas able to move to soft diet. since then my treatment was chemo, then surgery with a total gastrectomy, and then another round of chemo. Following surgery I started with a liquid diet after a couple days I was able to move toast diet and then gradually a little more substantial diet. As part of that process I would have times where I would start eating and then have to stop because it was like a valve closed and I couldn't ingest anything, this usually would take place after a couple of bites. I would regurgitate a little food but mostly phlegm. Things got better and that stopped for while. Over the last month this has resumed. Sometimes I am able to resume eating or drinking after period of time and other times it maybe several hours before I can ingest anything including liquids. I have seen where others say they get nauseous after eating, but I am hesitant to say I am nauseous. Now to My overall question is if anyone else is experiencing this and have you identified any triggers and things you have done to try and resolve this.