Comorbidity?

For the last few years, I've always thought that maybe my symptoms were associated with clinical depression and some sort of anxiety disorder. Now I'm thinking that perhaps I may actually have ADD/ADHD, since the symptoms I've been experiencing fit so smoothly. I've always been very obnoxious in class, though once I realize I've shouted out my opinion I get rather embarrassed and tell myself I won't do it again... Then I do. I'm always losing and forgetting things, and my room's a downright disaster zone. My teachers don't really treat me any differently than the other kids, mainly because I usually can do well enough on my own, and my mother just thinks I'm either lazy or something similar. I always feel like there's something bothering me, and often times there is, even if it's something considered "small." When I was younger, I used to have fits of anger/frustration over something as simple as not finding my pencil, and as I grew older I suppose these outward impulses became more introverted, probably explaining why I constantly blame myself for everything and have attempted suicide several times due to not being happy with myself. My question is... Is it possible to have both ADD/ADHD, severe depression, and anxiety at the same time? If so, how can I get help for not just one, but all of these? I've been through CBT and have a therapist and medication... But there are days when that's just not enough.