I'm sorry you're having such a rough time of it. First of all I agree with the other posters about seeing your physician — have some blood work done to check for hormonal imbalances, thyroid problems, diabetes, PCOS, etc. Even if everything comes back normal at least you'll have some baseline numbers to start from (e.g. when I started my LDL was "X" and now it's "Y"). Are you tracking the calories and nutirents you're getting? Fitday is a great tool for that. It may be that you're consuming more calories than you think, or you may not be getting enough of certain nutrients - for example calcium. (Studies have shown that having a recommended amount of calcium makes it "easier" to lose weight.) Or maybe you need to experiment with your protein/carb/fat ratios. Don't weigh yourself more than once a week weight fluctuates so much that more than once a week weigh-ins can be really frustrating and disheartning. (My weight fluctuates in HUGE ways throughout the day/week.) I'd also suggest you check out today's (4/29) Skinny Daily Post if you haven't already it addresses stress and obesity (once again, studies show that stress hormones actually make you gain weight). You might also consider weight training. If you can build some muscle, you'll burn more calories.
I was recently feeling a little discouraged about my own weight-loss journey and posted here about it. I really got some wonderful, inspiring replies. Take a look:
http://www.3fatchicks.com/forum/showthread.php?t=39446
This was stuff that you probably already knew about, but even if the information isn't all that helpful, please know that the sentiment behind it is one of support and good wishes for you. Grace