Remicade and back pain

I had 2 remicade infusions. I received benadryl 50mg IV before first infusion and had a terrible reaction to it. Rigor,shaking..at least an hour and while this was going on they administered remicade.
Bad headaches and some back pain ,nauseau first infusion. Infusion 2 neck pain,intolerable sinus head pain. Went to osteopath and most of the pain went away so it was from the stress of benadryl reaction. Hemoglobin dropped from 12 to 10.4 in 5 weeks but I also have genetic thalassemmia(anemia) and my diet ..well..almost none..vegetarian and iron content not as soluble.
Checked for rectal bleeding, urinalysis etc. All fine. Another cbc tomorrow and now dr. says if it's back up he knows it's the remicade and wants me off it(been stuffing myself with red meat, and all iron foods for nothing it seems) and if it isn't still no remicade. My skin has started clearing and now I will be very depressed once again after all of this..never mind the expense since my insurance company would not cover it.
Anyone else experience drop in hemoglobin drops?
Cierra2