my weight keeps going up and down.

Congrats on your 10 lb loss !
You need to make sure to weight yourself always at the same time for the data to be consistent. Also, weight loss not being linear, fluctuations happen a lot and water weight can give the impression that you gained a few lb. If your intake is below your expenditure there is no secret, it means you're losing weight

Are you weighing in at the same time of day and under the same conditions? ie morning after using the bathroom and naked? Or are you weighing yourself throughout the day or under different conditions every time you weigh in. 10 Lb fluctuations are pretty big and that to me would indicate you aren't weighing in at the same time and under the same conditions or possible using a different scale. Another issue could be your scales batteries.

http://community.myfitnesspal.com/en/discussion/1080242/a-guide-to-get-you-started-on-your-path-to-sexypants/p1

Floor - unyielding?

https://www.instagram.com/syattfitness/ he recently done a 90 day fat loss challenge but shows how scales fluctuates and why not to stress on it, maybe worth having a look

If you have ruled out problems with your scale or its placement, then what you’re seeing is probably water weight fluctuation and/or other sources of weight fluctuation that are not fat, such as undigested food.

However, you don’t mention how you are measuring your food, and you didn’t answer the question about whether you use a food scale. If you aren’t using a food scale, you don’t know whether you are in a calorie deficit. We therefore can’t rule out the possibility that some of the weight fluctuation might be fat.

Eating “clean,” the number of carbs you eat, etc. have nothing to do with fat loss. The only thing that governs fat loss is whether or not you are consistently in a calorie deficit.

Its tough to look at it that way, and I am guessing that you are not making progress. First, a human around 180 lbs could have as much as a 5lb swing based (how much they pooped, peed, how much water they drank the day before, how much they exhaled during workouts...where 2/3 of weight loss goes)....Second, it is more common that you hit a small plateau for a week and then start to lose again. I see weight loss like that...I lose for 2 weeks, then stall for 1 week...then lose, then stall...I am losing big weight, and you didnt supply enough info. Lastly, for me, when I started my weight loss journey, I was burning 3600 calories a day doing nothing (breathing, growing hair, keeping my temp at 98, blood flow, etc). I have now lost 70lbs and my calories have dropped to 3200 per day....there is less of me to move (causing less energy expenditure) and less temp to maintain, its easier to push blood. So as you decrease, it becomes hard that the "same activity" does the same thing. So to get my calorie burn workout of 400 cals, I have to move faster or push more weight in the same time as before, or I can drop to 250 cals in a workout....So progress means you have to do MORE, not the same because your baseline calorie burn is not the same. these are all the factors working against you when you try and lose, so consider these things. Walk more briskly at lunch, eat less carbs, and tighten your calorie deficiet. Good luck

I’m gonna go against what other people are saying here. Yes, congrats on 10lbs , but a 9lb fluctuation is significantly above the 5lb normal amount to fluctuate by. Please see a doctor and make sure your hormones and everything level wise is all good!