Had total thyroidectomy, and now being treated for being hypo. all symptoms are gone except my sex drive/libido, which still hasnt come back. why?

Hormone levels?: I suggest a GYN evaluation and study of your hormonal levels. Sexual dysfunction has multiple causes, not all related to thyroid function. Certainly things like stress, tension, anxiety, depression, malnutrition, inadequate sleep hygiene should be explored.

Explanation : Sometimes you need 3-6 month for adjustment after surgery and check out of dosage of your thyroxine dosage. Talk about it with your doctor.