When a person is severely depressed there is always a physical element to their condition. Thoughts of death or suicide, suicide attempts Irritability Excessive crying Chronic aches and pains that don't respond to treatment Of course, all people regularly experience one or more of these symtoms. But if these symptoms increase in number or severity or last an unusually long time, you may have what is called clinical depression . Personal experience causes me to agree with the above recommendation. Getting a correct diagnosis is important to recovery from depression.
Most medical doctors have at least some limited education in depressive illnesses.
Do not hesitate to make an appointment if necessary. They can be an excellent part of a support system.