Depression is not an all-or-nothing thing -- you can feel better in the morning vs. evening, or vice versa. Early to mid 20s is where conditions like bipolar (I or II) manifest themselves.
It's not uncommon for a situational event (like the ending of a relationship, transition from student to the working world) to trigger depression, especially when you're already under stress.
You don't mention anything about your day job, other than working as a developer at a Fortune 500 company. Could it be you are working at that job because you feel it is the "right" thing to do, rather than what you want to do? Maybe you should start looking for different work that is more in line with what you like to do. That's also a good way to see a salary increase -- in this economy it's not at all unusual to go 3 years without a salary increase. I'm in the same boat there.
In any event, keep seeing your therapist and perhaps even get a second opinion from another psychiatrist. If you are suffering from depression, you won't be able to "man up" or "try harder," or focus, because your body won't let you.
totally agree with the Could it be you are working at that job because you feel it is the "right" thing to do, rather than what you want to do? Maybe you should start looking for different work. As work takes so much of your day, maybe feeling disapointed there makes you disappointed in general. I'd try something else to do as work. Change is always good (and maybe all your problems simply translate to you being stagnant).
It's not uncommon for a situational event (like the ending of a relationship, transition from student to the working world) to trigger depression, especially when you're already under stress.
You don't mention anything about your day job, other than working as a developer at a Fortune 500 company. Could it be you are working at that job because you feel it is the "right" thing to do, rather than what you want to do? Maybe you should start looking for different work that is more in line with what you like to do. That's also a good way to see a salary increase -- in this economy it's not at all unusual to go 3 years without a salary increase. I'm in the same boat there.
In any event, keep seeing your therapist and perhaps even get a second opinion from another psychiatrist. If you are suffering from depression, you won't be able to "man up" or "try harder," or focus, because your body won't let you.