Suffered from thyroiditis for years and recently had thyroidectomy. what do antibodies attack if gland is removed?

Probably nothing: This is a good question. In most cases, hashimoto's thyroiditis is limited to the thyroid. Thyroid gone (or hypothyroidism) and there is no more inflammation. Presumably those antibodies don't attack anything. But people with hashi can get other autoimmune diseases, such as addison's, type 1 diabetes, pernicious anemia, and others. But this is not common.