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Cimzia "disconnected" side effect?

So I've been on Cimzia 400mg every two weeks for about 6 weeks (it wasn't lasting for 4 weeks). Just took my shots last evening, and today I feel like I'm in a dream, just disconnected from what's going on around me. I've never felt like this before. Blood pressure is ok, I'm not dizzy, but I wouldn't feel confident driving. Has this happened to anyone else? Any thoughts or suggestions?
I felt that when I was on Cimzia. But it turned out I was very low in B12. Once I started supplementing I felt much better.