Multi-Vitamin Packs?

[skinsguy]

My wife and I went to GNC this past weekend to buy some multivitamins. Since we both are concerned with weight loss, we wanted something that will kind of help boost our metabolism, but for the most part, we just wanted a good multivitamin. I wound up buying the multivitamin pack that is geared toward those who do pretty serious workout routines. I do P90X and sometimes will mix in Insanity as well. So, I figured I'd try them.

Anyways, these things must have a high level of caffeine in them, because I took these things for the first time yesterday morning, and I could not sleep last night. I was still wired, and I had no other caffeine drinks yesterday. Also, it's been giving me these cold sweats, as if I had a fever.

So, I guess my question is, what do you guys consider a good multivitamin to take, and is it normal for me to be experiencing these side effects? I took them again this morning, and made it into work, but I'm freezing to death and sweating at the same time. I also have a bad headache. It's only 9:30 in the morning, and I'm not sure how long I'm going to last today! Should I tough it out and allow my body to get used to them, or should I return these suckers and just go to Walmart and get a standard multivitamin pill?