Another common symptom of a mental health condition that often feels like a physical symptom is changes in appetite. This includes eating less or being disinterested in food. On the other end of the scale, this can also include using food as a source of comfort and, therefore, eating significantly more than before pregnancy.
Good nutrition is especially important for you, so that you can be strong and provide for your baby (whether you are breast-feeding or not). While your appetite may increase a little if you are breastfeeding, it should not change too dramatically.
So, if you are finding that your appetite has changed drastically, it can be a symptom that something may not be fully right with your mental health.