From 60kg to 69kg: How to stop the spiral and get back on track? (Need advice on cravings and discipline

Hi, I’m a student, and I’m 166 cm tall. Back in December, I weighed 60 kg with a 70 cm waist, but I just weighed myself and I’m 69.4 kg. I admit I’ve been off track lately, mostly due to exam stress and an increased appetite. By the way, even though I saw that number on the scale today, I’ve had a few cheat days recently and my period is a week late, so I think my actual weight might be lower. My waist is now 77 cm. I want to get back on track and reach 55 kg. I need help with staying committed and overcoming my sugar cravings. I’m literally crying while writing this(˶ㅠ︿ㅠ)