Should surgery be doneof enlarged gland due to hashimoto thyroiditis?

Big thyroid. From your description, it appears that the underlying problem is Hashimotos, and you have already had ultrasound and biopsy of nodules. Therefore, no suspicion of cancer. You should be on adequate thyroxine to keep TSH normal. In time, your thyroid will probably shrink some. The only reason for surgery is if the gland is so big that it interferes with breathing/swallowing.