Is the need to just eat junk food a sign of depression? also eating when not really hungry.

Possibly so: Changes in appetite and eating -- either increases or decreases -- often accompany depression. Using food to modulate mood is very common also. People may even have their preferred foods during these times -- like cheetos and other carbs. Studies have additionally shown a correlation between processed foods & depression. Some depression medications can increase appetite as well.

Sugar Addict: There is no 'need' to eat junk food. This sounds like an obsession or addiction to sugar. Which is very common. Some people find significant help by participating in groups such as overeater's anonymous when their brain gets involved and obsessed; or if one feels out of control with their eating.

Junk food: Not necessarily, especially since u seem stabilized on 2 antidepressants.