Can vitamines make me sick?

Patient : About a week ago I started taking Onesource brand vitamins because I am allways tired. For the past three day's I have been somewhat sick. I often have nausea. The nausea is bad enough that it keeps me from eating. When I do try to eat, it is as if I have no appetite. What little I take in moves through my system in a matter of minute's in the from of a very loose stool ( which I will have to note that even before starting the vitamins, I was experiencing a slight problem with loose stool). I am constantly thirsty. My mouth stays dry and my lips are begning to chap, despite the fact that I drink loads of water. I am begning to loose weight, in the last 3 days I have lost 3 pounds (which is no big deal being I could stand to loose about 10 pounds. I am 5'11" and 170 lbs.). I did try stopping the vitamines for a day, and I still felt bad. I decided to continue to take them, because of the fact I am allways so tired. My question is, could these vitamins be making me sick, and if so, will all vitamins make me sick or is there another brand I could try?
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