Glad the Remicade is working for you. Yep, prednisone does HORRIBLE things to you. It gave me insomnia like you wouldn't believe. My taper was always 5 mgm per week after it was once brought under control. The GI doctor usually started me at 40 mgm but when I became prednisone dependent the 40 didn't cut it. I then had to start at 60 mgm..ugh..what an ordeal.
Do they give you Benedryl before your Remicade infusion? If so, that is what could be causing your exhaustion. That is what it did to me.