A similar thing happened to me. I got nauseous, got up to go to the bathroom, and passed out cold. I woke up on the floor, and it took me awhile to figure out where I was and what happened. I had a big bump on my head too! I also broke out in purple spots and got so cold my teeth were clacking. This was my first allergic reaction. They stopped the infusion, and then started again later at half speed.
The next infusion they started at half speed, but I still had an allergic reaction almost immediately. All of the previous symptoms, plus stabbing pains in my kidneys, a tight chest, and really high blood pressure. They stopped the infusion, and that was the end of remicade for me.
I'm on Humira now, and so far, so good.
34 years old, Crohn's disease for 15 of them
Current Meds: Humira since 7/08, Pentasa, Effexor XR
Supplements: 3 kinds of Fish Oil, Multi-Vitamin, B-Complex, Vitamins D, E, & K, Calcium, Magnesium, Enzymes
SCD since 12/01/08 - eating Stage 3 foods