Your lucky. It sounds like you have a good Doc. Here is a tidbit that I am sorry I can't give you the reference to. I can't find it on my computer and I just stored it there the other day.

It said that when working with the thyroid in connection with depression, some psychiatrists found that a hormone supplement that contained more than simple T4 was often more effective than T4 alone in impacting depression.

I am so sorry I can't give you the source, but you might discuss it with your doctor. The source was not like "the Mayo Clinic" but it wasn't bad either, like a single doctor's exprience (although that isn't bad, its is not often authoritative enought to influence a physician's willingness to try something different.(

Sorry I can't give you the direct quote and the source.

Be aware that persons living in colder/Northern parts of the world are impacted by low Vit D and depression .

http://www.vitamindcouncil.org/depression.shtml

I happen to be both hypothyroid and needful of Vit D.
My winter SAD is not manifesting this winter with 5000 IU of D3.
I haven't used my light visor once yet!

This is a connection I haven't heard yet. I will pass it on. Also, you are taking a larger dose of Vit. D. than I have seen recommended. I presume you got both from the link you provided us. I will pass this along to others.

Thank you

You might find this medical video interesting:

http://www.youtube.com/watch?v=TQ-qekFoi-o

5000IU daily puts one at about 50ng... the lower end of the normal range. I don't take D in the summer when I am outside.
The new upper limit has been suggested now to be 10,000IU daily. This level was arrived at by studies showing daily 10,000 did not cause problems. I'd get tested if you suspect low D levels. You'll be interested to know just about every person who comes here, and has been tested has tested low or very low.
Dosing is based on this ratio... 10ng =1000IU
Use of D2 by doctors is a poor intervention. D3 is preferable.

More at :
http://www.vitamindcouncil.org/