Seriously, if you can do all these, I'd think you may want to go to Hollywood or NYC and sew for the theater or the movies.
Check out the credits of a decent movie some time. The actors get paid something like 90%, director takes 90% of the remaining, leaving typically 300k-400k (that's for a good movie, mind you) for the remaining 80-200 cast members (you know...the ones who did the work) to divide for their work. It's not great pay. It's not even good pay. I'm pretty sure the jobs are unionized and salaried, but that doesn't mean they make good money. Independent contractors, directors, producers, the absolute best writers, and the actors get the flexible returns from those huge productions. A good hollywood or broadway costume, lighting, or sound technician might make 30k per year, if they get hired into a good spot. The best money for a seamstress is wedding gowns. People pay tons for those, especially custom ones. Everyone wants a wedding gown that nobody else has. Oh, and how about the bridesmaids for another grand? That's where the money's at.
Sorry for the tangent. btw, those figures are totally made up; just guesses on my part. But, I'm very serious about costume designers getting crap for pay for big productions.
Anyway....
Here's how I see it: working excessively is fine. Workaholism is not. Once you find yourself neglecting basic needs, or secondary work (homework; housekeeping; etc.), you're a workaholic, and need to reconsider your priorities. I'm not one to tell someone to back up and take a break...I woke up after a 28-hour nap following MEW Con last year, got home, and got right to work for this year's con. Got 70 hours of work done within 2 weeks after the con, and I was holding myself back, as well as going to school full time. I'm pretty gung-ho, but I also care about the quality of my work, particularly my most precious work - my art. Now, I'm sure you (Jill) care about the quality of these cosplays, especially given the amount of work you're putting into them as a whole. When I go to the studio or MIDI lab to record a piece, I've already given it weeks to ferment and blossom into a well-written symphony. I record it as arranged, and most of the time, I'm completely dissatisfied with the outcome. In fact, I've never sat down, recorded a song, and been totally happy with it. On average, it takes 2 hours of studio time to produce 1 minute of good music. But you don't have the luxury of working in a digital format. If you make something, and it's not perfect, it's going to continue to be imperfect (this is why I gave up on making DDR pads; I kept finding myself rushing to meet some deadline, and thus sabotaging my work). There's no way around that, so don't push your craftsmanship beyond its capabilities. Do what you can to let deadlines and plans fall to the wayside, and create only based on your inspiration and compulsion.
Hope that makes sense/helps.