hi alex and welcome!
i'm sorry you're feeling so badly right now, but i'm glad you're actively recogizing it and working to resolve what's not working for you right now! amazing insight. good job!
depression usually has some sort of trigger. in this case, it's sounds like the breakup you went through and it's rearing it's read at you regularly since then. a body can keep busy and get away from it, but then the body gets tired of being so busy all the time...and it's still there

that's when depression can get worse. i think it's so awesome that you recognize it for what it is and are so willing to do something about it.
i so agree with seeing your family dr. if it's agreeable to you, it seems like you feel comfortable enough to talk to him/her...that's great! i can't emphasize enough on what some others here have said...make sure dr is realizing that you're not just going through a down time...make sure he/she knows how long it's been going on, etc. even write down things you want to say (points of issue) so you don't forget anything. sometimes, especially when we get in front of the dr, they start talking, and what we wanted to say simply leaves our minds...write it down!
i have a 17 yr old daughter who went through a massive depression after the death of her grandmother. i became concerned when i realilzed that it wasn't associated with the grief anymore..that it had become full fledged depression. it took alot of time and understanding, but once she admitted it and let us know, so we could help, things got better for her. i hope the same for you.
acknowledging and accepting are half (or more sometimes) the battle. you're well on your way
be safe, and let us know what you decide and how you're doing, ok?
kd