I have no food or drug allergies that I'm aware of. When I take multivitamins- no matter what brand, I start having slight body aches, have very swollen lymph nodes in my neck, and feel fatigued and slightly flu like. A day or two after discontinuing the vitamins, everything is back to normal. I do okay by taking no more than 1 or 2 vitamins each day of the week along with whole food supplements such as fish oil and powdered greens (the whole foods I can take everyday). I take a different vitamin each day for fear of reaction although B-vitamin complexes, C, A, E don't seem to cause a reaction when taken consecutively but I try not to take too much anyway. I haven't tested other vitamins consecutively. What could be going on?