"Weight gain with hyperthyroidism isn’t common, but it’s possible. It usually happens after you start treatment for hyperthyroidism and gain back weight you previously lost from the disease.In rare cases, it can mean something more serious. If you have hyperthyroidism and are gaining a lot of weight, talk to your doctor to figure out the best treatment or diet changes."
https://www.healthline.com/health/hy...-gain#takeaway
One thing to check on is if your Graves Disease has now become Hashimoto's Thyroiditis (swinging between hypo and hyper thyroid)
canadjineh (I'm hypothyroid - but treating with 30 mg dessicated thyroid, and selenium supplements to lower thyroid antibodies)