Welcome to HCM.
Blood reports and ultrasound
is normal than there is no need to worry for thyroid
,but you have to keep regular follow up for it because you have family history.
Weigh gain is may be due to your life style and diet pattern.
Swimming,cycling will be helpful to reduce your weight.
Avoid oily,high calorie food.Drink more water,fruit juices.Make proper diet plan
under guidance of dietitian.
You can take b12,calcium,vitamin supplement to recover your generalized weakness.
Keep in touch with your doctor.