It takes time for depression to go away, but you're taking the right steps by getting out with people when you can. The fact that sometimes you feel better is a really good thing. Don't get angry or upset when you go down again, just try and get through those days. Look forward to the days you start going up on the rollercoaster again. It sounds like you would benefit from some professional support. Do you have a therapist / can you talk to your doctor?