I'd like to weigh in on this (no pun intended). I have now hit three plateaus. I agree with you that they're frustrating but trust me when I say they are not forever. The longest I had was 6 weeks.
Some positive points about hitting a plateau are:
1. You're not gaining weight.
2. Your body is showing you that it can adjust to a set form of eating habits without losing or gaining. This should prove to you that you will be successful when it comes time to long-term maintenance.
3. Your body is responding to the micro and macro nutrients you are putting into it by burning what you put in--nothing more, nothing less.
4. It's
completely natural to hit a steady point after losing a lot of weight. Yes, 50 pounds is a lot of weight to lose.
Now hopefully you feel a bit better about your plateau.
Obviously, though, you want to break out of it. I broke out of my most recent plateau by switching up my workout. I see you are active because you mention not eating your activity points.
My best suggestion would be to
switch up your workout completely--I can help you with this if you want
--and start eating your activity points. However, eat only what you feel you earned and always eat the activity points
immediately after you exercise. Get the most protein out of these points as you can. Do not just have juice, sugar or carbs. Protein is key.
My second suggestion (you can do both, actually!) would be to
switch up the things that you are eating. If you eat a static number of points (essentially calories) every day, your body has become used to that allowance. Try focusing on getting 40% of your calories from protein and 40% from fat with the other 30% from carbs instead of just point values. Try point shifting. Essentially point shifting is like the Wendie Plan. I have been doing this before I read about it on the board. I hit a plateau once and needed something to shake me out of it. I read about calorie shifting and decided to apply the same logic to points. "Confusing" my metabolism worked for me but different things work for different people. If you think that's too restricting, try alternating Core and Flex for a few weeks. 1 week Core, 1 week Flex, repeat. Just shift your food intake somehow so that you body sees a change.
My third suggestion would be to
switch up your eating schedule. Your body can probably time and has come to count on your eating schedule. You could try the king-prince-pauper method for awhile of eating a big breakfast, a moderate lunch and a small dinner. You will then have less food in your system when you sleep and you will break the fast with a good breakfast (high in protein) when you wake up. Another method to change your schedule would be to decrease the amount of points (calories) in each meal you have but increase your meal frequency. 5 to 6 small meals per day can really be beneficial. Basically your body will have a small meal, burn it after 3 hours, have another small meal, burn that after 3 hours, repeat.
The best way to shake yourself out of a plateau is to shake yourself up.