i have been doing Weight Watchers for a long time and i had the same problem, i wasn't seeing the results and i was getting frustrated and wanted to give up. i was doing the biggest loser workout DVD and working my butt off everyday for 45 minutes 6 days a week.
one thing i had realized was that i needed to measure my inches, i was losing inches, but not pounds and i had even found myself not losing anything on occasion. i know how frustrating it is and i have tried many many times and i have failed and given up, i am hoping this time will be different.
the biggest thing i found that is a problem is that i was eating low fat desserts every other night and it was within my points, but weight watchers even warns that you need to watch your sugars and carbs even when it's within your points because your body is going to have a hard time losing the weight.
i learned that i couldn't eat low-fat ice cream or anything like that and if i wanted dessert, i would eat fresh fruit or have a cup of tea with some in it... If you don't know what stevia is, click on that link... artificial sweeteners have bad side effects to your body and they are not healthy even though you think you're doing something good for yourself. i know how hard it is when artificial sweeteners are taken away from you too, i wouldn't accept the fact at first when people would tell me that they were bad, but once i cut them out, i noticed my body was becoming healthier and i was actually losing more weight. refined sugar is horrible as well, stevia and maple syrup and honey are the best ways to sweeten your foods.
to become healthy you need to make a lot of changes in your diet, not just lowering the fat and sugar... don't worry about the weight right now, just worry about becoming healthier. cut out all the chemicals in your diet, like artificial sweeteners, hormones in meats, pesticides on fruits and vegetables... it's a lot to ask for and it can become costly, but just worry mostly about the artificial sweeteners and sugars and fats. at first eating regular fruits and vegetables is better than nothing and once you get a taste for it then you can slowly integrate the organic foods in your diet, you just need to learn how to do it first.
another trick i have found that helps to keep temptation from over running your efforts is to tell yourself that you DON'T LIKE whatever it is you want to eat, you might still eat it, but don't feel guilty when you eat it because that can cause you to retain the fat more when you stress over it... if you are going to eat it, eat it, but don't feel guilty about it. just keep telling yourself you don't like whatever you are tempted to eat and after a while you won't want to eat it and if you do, you actually won't like it because of the psychological ideas you are putting into your mind.
sorry for writing such a long post, i just wanted to give some tips/advice on things that i do that help me sometimes... it's all about discipline and it doesn't work overnight, it takes time and even when you crash and burn, you need to just keep going and try harder the next time.
-Stephanie