What did the FNA indicate? The calcification and intra nodular vascularity (blood flow) makes cancer somewhat more likely, but not definite unless the FNA came back positive.
Have you had thyroid function tests done? Those would include Free T3, Free T4 and TSH...
Total thyroidectomy would leave you permanently hypo and dependent on replacement thyroid hormones for life, but that's not so bad. Many of us who have Hashimoto's are dependent on replacement thyroid hormones... it's, typically, a pill in the morning before you eat/drink anything else, then you're good to go for the day.
If you have results for thyroid function tests, please post them, along with the reference ranges from your lab report.