Losing weight fast and regaining it faster is very common after strict diets, and it isn't a willpower problem for you. Night shifts make it harder, because your hunger and sleep hormones follow your body clock. At your current weight, a doctor-supervised plan makes much more sense than trying another diet on your own.
Next Steps
Please see a general physician or endocrinologist, who will first check your
thyroid, blood
sugar and cholesterol. If your periods are irregular, ask for a PCOS check as well. Your doctor can then tell you whether medical treatment is suitable for you, so please don't start any weight-loss pill on your own.
Health Tips
On shift days, try eating your main meal before work and packing protein-rich food for the night. You'll find slow, steady loss easier to keep off than a crash drop.