Do I Have Chronic Depression? I've Looked At Symptoms Online,

Do I have chronic depression? I've looked at symptoms online, and I've had depression in the past for bout 2yrs. Then I moved in with my mom, which then I didn't have depression for 3-4months. I have depression again, I've had it since this summer and I think it's gettin outta hand. I'm sick of having depression and am wondering of ways of getting rid of it. I just want to feel joyful and happy again. I always feel hopeless and lonely and think bout suicide all the time.