Actually darling their are several things/illnesses that can cause both a person to choose to force themselves to vomit &/orhave oesophageal reflux &/or refusal of the throat to swallow food. Some of these are "medical" some are more "psychological" but none the less real. One is throat cancer & even if this man has had bulimia that doesn't rule out other causes for what is now happening. Another cause that I have experienced that has made me force myself to vomit is allergic reactions (including to foods that i'd previously had no problem with at all) or to food induces nausea which can also be the way a food is cooked - here I cite my grandmother who developed this problem in her late 70's with regard to fried foods.
We can debate this till the cows come home & it won't alter the fact that he needs help. But first he needs to be gotten to the dr!! Bulimia, even if that is what he has wrong & is all he has may not be the best tactic to use to get him help, whereas indicating concern about his oesophagus may be less emotionally threatening to him & so get him to the Dr.
The dr can then question, test & hopefully correctly diagnose & treat this man.