Thank you so much everyone.

Sebastian passed peacefully, he had no fight left in him. We didn't see our regular vet as she's away on vacation but we saw the surgeon who did his adrenal surgery 2 years ago. He's a wonderful vet and human being. He made the whole thing a little less stressful/painful. He examined Sebastian and suggested that some of his pudginess was inflammed lymph nodes and suggested that he believed that Sebastian, in addition to his adrenal issues and insulinoma was also suffering from lymphosarcoma. My poor boy. I stayed with him a while after, cried all over him and gave him some final kisses. He's playing now with his brother Miko and adopted brothers Trouble and Rascal. I will miss him and never lose the footprints he left on my heart.

My life is a little emptier now without him.