This is all the effect of entering the last stage of the first archetypal phase, the Shadow. I've been through it. Basically your unconscious is exhausting all the possibilities Ti alone can offer. Reaching the end of this possibility range correlates with an internal biological change that unites the ego with the unconscious, and in the case of the INTJ, brings extroversion to the surface as a "slave function" for the other four. (introversion in particular)

In other words, this is just temporary and will pass, but there is no easy way to get through this time. My advice: find a dual.