Weight is stuck,. So much disappointment.. losing hope wanna cry :( !

You're doing nothing wrong. You still lost weight.

You don't need to speed it up, that rate of loss is healthy and sustainable.

80lbs will be gone in no time at that rate. Celebrate every pound you lose, you should congratulate yourself. Don't look to the negative and think it's not enough.

You're closer to your goal

You are losing weight at a healthy rate. At your weight range it's quite normal to lose 1-2lbs per week, but some weeks it'll be less, some weeks it'll be more. You're at the beginning so don't stress too much about how quickly it goes, I would advise you to focus more on creating a good base in eating habits now so you don't fall off the wagon later. See how you can fit 1200 calories into your day in a natural way, create new favourite meals, snacks, so you don't need to think about it later.

I read up on your medication, I didn't like the side effects, but if your doctor said it's good for you then I won't question your doctor. I can tell you from my personal experience that I lost 80+lbs myself in a year with just a calorie deficit, no medicine involved. So it's doable, but you need to stick to the program.

Are you working out? Are you weighing all your foods? Are you logging everything that passes your lips?

When I lost a bunch half a decade ago, my weight loss was not linear. I dropped about 15 pounds quickly and then just sat there, for what seemed like forever (but in reality it was only 3 weeks), and then during the 3rd week I lost about 6 pounds bringing me back up to a 2 pound/week average. Weight loss is definitely not linear. The scale lies. Just keep counting calories and it will come off.

If you want to ensure 2 pounds/week as you get closer to the goal, hit the gym hard. 5-7x a week. If you can manage to burn an extra 500 calories/day from exercise (about an hour a day), that'll be an additional 1 pound/week, which means you can eat more and still lose 2 pounds a week.