First- don't panic. Have you been losing inches? The scale is not always the best indicator of change. It sucks because we have been taught that we live or die by the scale, but really there is so much more going on. If you are losing inches, hang in there. You are making progress.
If not tho, here are some things you can try.
1. Track your food. Don't change what you eat, just write it all down for a week. At the end of the week you can look back and analyze. Are you eating a lot of sodium? That can stall your weight loss. Eating lots of carbs? Not eating enough? All of these things can be discovered by writing it down.
2. Try eating more. If you are eating well and not losing weight, maybe you aren't eating enough. Low calorie diets are a terrible idea. Here is a cartoon I just drew in paint to illustrate my point.
2. She is happy but her body is sad. It is hungry and thinks she is stranded on a deserted island so it stores everything she eats as fat, because it doesn't want to die.
3. Girl doesn't lose weight.
4. Girl unhappy.
Moral of the story- maybe your body thinks you are on a deserted island. Throw it a bone and see what happens.
3. Be honest with yourself. You have plateaued, which means you are probably grumpy and not trusting the process. So you skip a couple workouts, and have a couple hand fulls of m&ms every now and then. And a soda maybe. And Taco Bell just once. Don't kid yourself! you might be the reason you have stopped losing.
4. Switch it up. Your body is picky. If it gets bored, it wont respond the same to what you have been doing. Muscle memory is a thing. When you stop challenging it, it stops doing what you want to do. Switch it up. Try a new class at the gym, pop in a new dvd, check out a spin class, just do something else. Treadmill and Zumba will get you started, but it wont keep you going. Your body needs a change.
5. There might be something legitimately wrong with you. Not to freak you out, but if you REALLY are working out as much as you say and you REALLY are eating as clean as you say and you have tried eating more and switching it up and STILL no movement- you might want to see a doctor. Take that food journal you made and show him what you have been doing. Have your levels checked. Better safe than sorry.
Most of all, don't give up. This road is not straight. There are bumps and curves and you will get through it. And try not to stress too much! Stress can cause you to retain weight too.