Quick Pondering on Gender and Body Dysphoria

Anorexia, bulimia, and body dysphoria are are disorders that perceive the body as being out of order. These conditions construct false beliefs and feelings that bodies are flawed and imperfect, or that something with the body is simply out of whack. Anorexia and bulimia differ some from body dysphoria in that they may be motivated by perceived societal expectations, while body dysphoria is an offshoot of obsessive-compulsive disorder and so sees any unevenness or flaw in a body and disordered unevenness. Nonetheless, all of these are based on a sense or feeling of wrongness. 

Let's take anorexia for example. In all likelihood, an anorexic person may be sickly thin, but they believe and perceive themselves in the mirror as fat.Yet, we do not believe it good psychology to affirm their belief in their non-existent obesity, because that would feed unhealthiness. Therefore, my question is, "Why do we treat gender dysphoria differently?" 

Often times, gender dysphoria is primarily reliant on the self-diagnosis or set of feelings a person has regarding their birth sex or gender. A person may not feel like their sex, so they perceive that they must identify with the opposite sex. Yet, this is largely imaginative. A male, by physical nature, can only imagine what the opposite sex feels like or what is truly experienced by women. He cannot therefore know that he is a woman by some misaligned nature. It is largely conjecture, though it may be sincerely held. Though it is likely that a hormonal imbalance contributes to these senses, which can be regulated. 

If I believed that I exhibited the symptoms of a disease and self-diagnosed, it could be physically dangerous if I self-treat and find out I had no disease or the wrong ailment. Extended to the extremes, this could become hypochondria or even Munchausen syndrome. Yet, deference regarding sexuality and mental health surrounding sex is largely given to the patient based on their assumptions. Are we doing people a disservice here? Just thinking.