That's ridiculous!!! That's like saying that they'd let someone get near death with cancer before treating with chemotherapy!! You need to find an endocronologist and if you haven't had a full thyroid blood panel run, ask for it - including free T3 and T4. Then your doctor will begin treating your symptoms and you will feel better.
Hashi's may NEVER kill your thyroid, why would someone expect you to live feeling crappy for the rest of your life? It sounds like your doctor just doesn't fully understand the thyroid or how it works. An endo will - that's their specialty. Please post what happens for you. Everyone here cares!!!
Practice Compassion...Heal The World