http://www.aafp.org/afp/20050115/299.html VIT D studies by endos, and it says VIT D is an important vitamin and it was linked to mental changes as well as physical changes and it said fibro CFS graves diease hashimoto hypo hyper etc should be checked for this sometimes its HIGH too much in our system but mostly its low its not a cure its a HELPER mine was proven dangerously low with my hypo symptom and normal TSH my ex hubby is graves diease with speech problems hes getting this VIT D level checked next week it will be awesome to know a simple vitamin is all he needed to help with his speech factory being in low gear.
It may take 3-6 weeks to notice a significant change -- also need to make sure it's an adequate dose of synthroid -- if he is a bigger guy, then 125-175mcg/day is often needed. Close followup (every 5-6 weeks) to re-evaluate dose is important.
Make sure your husband take enough Synthroid supplements. Usually 125mcg is the average for post RAI people. If he is taking less, increase slowly, like increase 25 mcg every week until he feels better. Once he get the correct amount, he should be back to normal, may take a few weeks, or months, but in most cases, everything should be back to normal. So, take and adjust Synthroid, and get blood tests (get Free T3 and Free T4 test), make sure get his Free T3 and Free T4 level to the top part of the normal range. His body should tell you where is his best level.
my ex hubby is also dx with graves diease, he was only 23 when his thyroid crashed almost died , they gave him iodine and over dosed him and killed his thyroid so now he knows when hes weak and not coordinated his levels are off hes on 100mcg of levethyroxin and cytomel 15 mg check with your ENDO maybe your levels are off he has since graduated to aricept at 34 cause he was having trouble thinking and talking hes also born hearing impaired so we use sign language when hes not making any sense talking , hes been under a neurologist care hes talking better and acting better more normal so it can't hurt to ask your dr if aricept will help his speech since our thyroid cause our whole body to whack out!