I always get hives from my Humira, Lovely.
I have to premedicate with benadryl and prednisone just to be able to take it.
BUT Humira has been the only medication that has worked for me.
Also you may want to see if you are allergic to Latex. I am allergic to Latex and some of the syringes have latex in them.
I do the pen. =)
Are your hives around the injection site?
sorry your having hives but I hope they figure out why soon!