Don't self judge or diagnose and no self medication is allowed authentically even for dr's so kindly spare time to consult in person for examination and assessment with blood test

Are you sure you have hypothyroidism not hyperthyroidism? In hypothyroidism weight increases gradually because of disturbance in the digestion process.

Take it regular.  And do yoga and take fibrous fruit and vegetables salad

You need to take proper medications for hypothyroidism.  Continuously losing weight is not a good sign.

Hypothyroid and weight lose usually don’t go together. You can manage your thyroid functioning by using kanchnar and trikatu churna in your diet. Have triphala powder to cure constipation. Weight lose will need further interactions

Use Kanchanar.. it balance your Thyroid hormone level , further queries consult through practo

Continuous weight lose usually doesn't happen in hypothyroidism.Pls send lab report and medicine u are using. U can have Dhanya water.

Lifestyle changes and dietary changes needed as per constitution

If you want help I want to know a few things first- 1- What do you prefer eating (weather it is spicy/sweet/cold/hot) 2- How is your gut? -how many times do you go for defecation -recurrence of constipation ? 3- How is your Agni? How frequently do you get hungry? 4- what medication you are on right now? 5- any surgical or medical history? 6- Parent's medical history? 7- your height and weight? 8- skin complexion?

U have to consult in detail atleast online for a thorough analyses.

Consult ayurveda physician for proper diagnosis and root cause of ailment