Before commenting in detail about your lab results, why would the doctor test you on 3/4 after just starting you on Synthroid only 5 days previously? With T4 meds it takes about 4 weeks to build up to 90% of the final effect on serum T4 levels. Also, what was the starting dosage? Were you tested for the antibodies associated with Hashimoto's Thyroiditis? Those tests are TPO ab and TG ab. Have you had any iron related tests, like ferritin?
He was testing T3 and T4 to get a baseline on them, they will be re-measured before I go back in late April. I included the TPO and TG antibody tests above. I have not had a ferritin test done yet, but hemoglobin was 14 (11.1-15.9 g/dL) and hematocrit was 41.6 (324-46.6%). Starting dosage of synthroid is 50 mg.
As you know D3 levels are low. But also so are th B-12 levels. Many countries the B-12 low end of the reference range do not even start until 500. And many people do not feel well until their B-12 is towards the upper end of the range. Certainly above 700 if not above 900. So it may make sense to also start to supplement with sublingual B-12.
Your thyroid tests and symptoms are consistent with Hypo. So starting on thyroid meds seems like a good thing to have done. But as pointed out above, the thyroid tests need to be taken again after about 6 weeks or more after starting the medication when using a T4 medication such as synthroid.
FYI you should ALWAYS request a copy of your test results and include the ranges. And along with that you will want to write down the dosage of all medications and supplements you are taking and maybe most importantly the symptoms you are having. You can put this into a diary or a spreadsheet etc. But it is absolutely important for your own good to have this record. Especially the link between you clinical symptoms with the blood labs and dosages. This way if you ever have to change Dr's you will have a record wherever you go. DO NOT rely upon your medical record even if electronic. Also you may have to fight with a new Dr who insists that you are wrong about the dosage and blood levels. If you present the Dr with a history documented of how you felt at various blood levels and dosages you will have a honest chance of winning the argument.
Besides such a record will allow YOU to see progress which sometimes is so slow and it is easy to get frustrated. So looking back at your levels and your symptoms from several months ago you may be able to see that you are in fact progressing albeit slowly.
Thanks flyingfool for your help. I hadn't realized the B12 was also considered low so I'll start supplementing that as well. I always keep printouts of my labs, but I really need to start a symptom/meds diary.