Been struggling with Hashimotos since diagnosis in Sept 2017. Was initially over medicated with levothyroxine - ended up with thyrotoxicosis and tachycardia. Now taking 50mcg daily. Feel awful - fatigue / anxiety / hair loss / brain fog / insomnia. Endocrinologist has given up on me I feel. GP is excellent. Is my only option to take levo and feel rubbish forever? Despairing. What would happen if I stopped taking levothyroxine?