question: I am a thal minor. My iron levels were not low any previous times i checked. But i have been feeling v tired for abt a year. I researched and started taking b complex vitamins and extra b1 b6 b12 supplements . I take vitamin d also. At first i felt v healthy and my restless leg syndrome disappeard too but Lately i feel fatigued more and v dizzy most of the time. Could i be overdosing?