I really don't know what to do

I have these things that I call "depression phases", although there's probably a more official phrase for it. Basically, I become super depressed for about a week or two and just I just don't do anything. I don't call any friends, I just lay on the couch all day and watch movies, thinking that somehow Kevin Smith's movies will help me get over my problems. I feel like a useless human being, and that I'm just good for nothing. I can't get a job, I don't really have any friends. I just feel awful. These happen all the time and I usually do get over them pretty quickly.

However, this one is much worse. Everything just seems to be falling apart around me. It seems like whenever I'm not on my couch I'm either at school, getting food, or arguing with my parents. This has been going on for almost 3 weeks now, much longer than usual. I tried working out to help myself, but it really doesn't seem to be doing anything. My parents tried getting me a counselor but I feel like it's just making things worse, and when I try to tell this to my parents they just tell me that it takes time and we start arguing about it. This is also the first time I've seriously started thinking about suicide and actually looking up methods.

I really don't know what to do. I feel like I've tried everything yet it still feels like my entire world is just falling apart around me.

EDIT

Sorry if this isn't really well written and stuff, this is my first time actually talked about my problem to anyone.