vitamin b12 deficiency
"I was on Vitamin B12 injections years ago and felt good, the thing is my workmates mentioned how I was different.  I also have a thyroid problem and have started my injections again. I just didn't know why or what had me feeling so bad. I was diagnosed with BiPolar, but I wonder even with just B12 deficiency or thyroid alone, they have such a impact. But together I am very affected.  Once I feel better I will see if I am BiPolar.   The B12 injections do help, maybe not instantly, maybe days or longer, but they help 100%."