Bit strange in between my infliximab infusions

Hi everyone, Have been on infliximab now for 9 months, Now on it every 7 weeks. They reduced the dose a little as I was manic for two weeks and that has helped, however I thought I was just picking up bugs in between infusions, but I am starting to see a pattern. I feel suddenly crap, bit dizzy headaches, vague symptoms but they stop me in my tracks. Now I am 6 weeks so far....having a period. All bloods normal but that means nothing to my body!!!
Oh I have headaches, one now for a week. Anyone with information????? I will be seeing my consultant in a week, but rang the nurse and she does not think its anything to do with infusion. Was thinking of returning to work but have spent a week lying down instead incase my BP is dropping.