I have been vomiting after every lrg meal for 25 years. NOT INDUCED.If i over eat it comes back up?? why?

I have just gotten used to it all these years..After eating i throw up.. Then 1 hour later i am hungry again. I havent mentioned it to my doctors because i am very self consciuos about it- My weight and stayed about 123 for the past 10 years. I am now 35.. Now that i am older i am thinking about throat cancer developing or something serious. I ve done some research online but cant find anyone with my problem. I think its something to do with the flap at the end of my esphagus (spelling?)- Anyway, just wanted to throw this out there and see what happens. Opinion are great just dont be mean- I am not bulemic!!