Possible depression, any advice?

[Sigurd]

I wanna play therapist....

Your have been overburdened with work.
Your situation is very much like that of a car with a flat battery. You need to recharge your battery. If you don't, you won't get anywhere.

You basically need to do something that you enjoy and get your mind of things. This could be a 20 minute jog every day, or it could be some hardcore partying every thuesday night. Or building model airplanes. It doesn't really matter...

The breakup with your girlfriend makes you sad, which doesn't really sound abnormal.