Hello, Shabur. My relationship with food and eating has at times been ... problematic.
Suggestion: If your situation permits, exploit your doctor's appointment to get a comprehensive (not basic) metabolic panel and have them explain to you all the results.
Personal Opinion: "Disordered eating" of various types ought not to be approached as a solely mental health issue. For example, if one is not hungry at times and then ravenous at other times, it is valuable to explore the metabolic, endocrinological (hormonal, chemical), circadian and other possible dimensions of what the person is experiencing.

I wish you success and health.