Sounds like we were on a similar schedule. I was diagnosed in August 2000 with 2B HD, had the night sweats, etc. It came back and I underwent a stem cell transplant last August. Because of the radiation to the neck and chest, my thyroid has since been slowly shutting down. Weight gain is one of the symptoms that the thyroid was not working properly. Other symptoms...thinning hair, constipation, dry skin, depression, always feeling cold. I would suggest seeing an endocrinologist and have your TSH level checked to rule out hypothyroidism.