Advice? How to stop fluctuating

To stay motivated and keep going, you have to... stay motivated and keep going. There's really just no trick to it.

I would say finding healthy foods you actually like to eat is helpful, so google recipes and find ways to make recipes you already have better for you. Also, let yourself have things that you want, just in limited portions. If you're being super strict and denying yourself everything, you're more likely to get frustrated and give up.

That said, you DO have to give up things. I've seen a lot of people who want to lose weight not succeed just because they want to eat the same unhealthy foods and huge portions they've always been eating. You're going to have to accept that that can't be a part of your lifestyle anymore.

To stay motivated and keep going, you have to... stay motivated and keep going. There's really just no trick to it.

^ this, but also try to understand that your weight will fluctuate a bit, always. Whether you're losing, gaining or maintaining, your weight won't stay exactly the same. When you start dieting, part of that initial loss is water weight. When you "give up" and eat normally again, you gain that water weight back. You're not losing 5 lbs of fat in a few days and then gaining it back just as quickly.

Try to look at the bigger picture. Weight loss isn't linear and it doesn't happen nearly as fast as most people would like. Accept that it's going to take time and try to find motivation other than the number on the scale. Work out why you want to lose the weight, and keep reminding yourself of those reasons.

If you want to lose 50 lbs, and keep it off, it's going to take time, and you're going to have to make some permanent changes. That doesn't mean you have to give up your favourite foods. Some people do, but I haven't given up any food or food group, I eat all my favourites regularly, and I'm losing the weight. You've just got to try to create a diet and lifestyle that doesn't feel like torture, so you don't feel the need to give up.

There's a great quote floating around that has really helped me:

Losing weight is hard.
Maintaining weight loss is hard.
Being overweight is hard.
Choose your hard.