Stretched Too Thin

Firstly, I want to apologize for neglecting this blog I started. I have to admit, I experienced a lack of faith. My enthusiasm waned after I heard that Yoshihiro Tatsumi had once done 50 pages in one night. How could I ever compete? Sure he had assistants, but...
Another thing is I have way too many commitments right now. I have two jobs, I'm working on 3 comics and 1 zine, plus I have my community and school obligations. What can I do to get out of this mess?
I know the first step it just say no to new projects. And I try, I really do.
Does anyone have any tips on juggling too many projects? I have a daily planner and that helps.