I've been struggling with low TSH & Hashimoto since February this year. Many test and multiple doctors visits and one Naturopath visit and much research on my own. I've been taking a Thyroid 130 mg supplement. My TSH is now normal. I now take two daily. Hashimoto gene can not be turned off only managed by diet. Cutting out all gluten, wheat, soy and the hardest is dairy. Even my make up and body products including toothpaste/mouthwash are GF. Avoid fluoride as well.
Eat simple foods and organic. Veggies and meats and following a Paleo type diet can make things easier. Cook all cruciferous veggies such as kale, broccoli, etc. Since they contain goitergens which cause the goiter for people with hyperthyroid conditions and watch out for nightshades due to inflammation. Avoid iodine foods and products. Maintain healthy vitamin D levels as well. And careful on exercising. Give yourself time to heal then keep it simple. Walking and gentle stretching yoga a few times a week is best. Learn to listen to yourself. The body does talk to us, we just need to pay attention and go with what makes you feel better not what doctors, media or what works for others. Each case is individualized so learn what works for yourself.