First remember I have no clue what I'm doing so its a warning. Anyhow I was taking b12 and the b complex and I think it was adding to my dizzy and horrid neck. I still get it sometimes since stopped but not as long or bad. Not sure though. When I asked another forum about this they said I may have an allergy to it? I have no idea but like yesterday I didn't take it and I felt like dizzy so it may have no connection. I was researching the vitamin e and I think there is an upper limit to that which could be harmful. Now I may be wrong but something to look into. Also it may have not been with this but I heard when repairing it can make you feel worse. Like your body is confused. I'm not so with that idea is it seems with pn alot makes it worse now but supposely suppose to help. I'm sorry your having such a hard time too.