Welcome to HCM,
Your weight is increasing and yet diagnosis of Hyperthyroidism
it is unusual,commonly with good appetite hyperthyroid patient lose weight.
You have gained weight almost 10 kg, you should visit Physician/Endocrinologist
to reassess the cause of weight gain and also review what drugs you are taking and have you done repeat Thyroid function test.
There is possibility if you are taking Antithyroid drug continuously without proper monitoring in fact you may have developed Hypothyroidism
Other possibility is excess calories consumption and less physical work and last is some other hormonal
or metabolic problem.
After examination and proper investigation once cause id detected it can be treated accordingly.
Please take care