Blood and mucas even tho remicade levels are good?????

I have been on remicade for a year.  Worked pretty good up until about 8 months and then I started to show symptoms.  I informed the doctor and he checked my remicade levels before my just past infusion.  They were good according to my blood work.  I had been flaring up about two weeks prior to the infusion, using prednisone in between infusions for at least my last three.  My nausea is horrible, morning, noon and nite.  I ended up in the hospital just this past Saturday with horrible pain in my upper right, under my rib cage.  They said my white blood count was elevated, my magnesium was low and I was dehydrated.  They did a cat-scan and said that my gallbladder had thickening of the walls.  I have never been so sick to my stomach as I am lately even while flaring terribly and going to the bathroom 15 plus times a day.  Anyone have any suggestions for me.  I am seeing my GI today.  I need some answers.  I am so sick of being sick, tired and sick to my stomach. 

it seems like the remicade lost it's effectiveness a few infusions ago if you have to use prednisone so often. have you tried other bioligics like humira or cimzia? remicade stopped working for me after 5 infusions so those will be next in line for me.