Thank you all for your replies.
It is good to know that there aren't many side effects.
I only began Humira last week and so far no reaction. I've been having lots of headaches, also experiencing some low grade fevers.(I don't know if this is related to the Humira) And at times I have some nausea. Still have diarreah though. And also getting bloating which is due to the inflammation in my small intestine. I've had crohn's now for 28 years. I've had 2 surgeries, 2 draining fistulas and have been on Remicaid, Entocort, Prednisone, Imuran. Lately have been experiencing some blockage and doctor has finally decided I try Humira. If this doesn't work for me, I will probably be requiring surgery. I hope it helps.