Hi Molly. Sorry to hear of your discomfort. I ususally post in the Lupus or MS forum because I have been experiencing similar symptoms as you but haven't been diagnosed. Since you have bi-polar, it seems like every new symptom you develop will be blamed on the disease or the medication and you will have to really PUSH your doctors for proper testing. I would start out with a blood panel of a CBC w/ diff, sed-rate level, thyroid profile, diabetes and yes, check for vitamin diffiencies because they can mimic neurological disorders.
I get this burning pain in my feet sometimes and my joints in my left foot will just ache for no reason. I have many other symptoms and I have been "sick" since October and still my doctors don't know what is causing it. You are correct to assume that it isn't fibro because one must have at least 11 of the 18 pressure points in order for a diagnosis. I thought I had fibro too until I realized I don't have any pressure points. Since auto-immune diseases run in your family, I would share this info with your doctor. I would start of by seeing an internist.
I do hope your symptoms will get better but if not, please be mentally prepared for the long process of getting to the cause of your symptoms and try browsing the lupus or MS board or even the immune disorder board as I'm sure you'll find lots of others with symptoms like yours. Oh, how did your symptoms start....after a viral infection???
~~~Kristine