Shelly,

My wife is in same condition as yours ...infact worse (or was worse).
Apart from all the good and very important things mentioned here ...first of all you need to find a good doc who understand the value or armour.
Thyroxine does not help in (YES,its true!) treating hypo patients as much as armour (dessicated thyroid hormone) does.
-Depending on how your ferritin level us ..you need around 150mg of elemental iron.My wife takes Proferrin iron tablets(it's heme iron ..no stomach issues AT ALL)
- People who are hypo also needs their adrenals tested( if your body temp. is low ...your BP is on lower side most of the time..that's a good indication)
- You need your Vitamin D level tested ...thats generally low in HYPO patients.
you can go to www.stopthethyroidmadness.com ...it has lot of good info in it for hypo's.
As far as B12 goes ..this forum is THE BEST