Under stress, ISTJs may fall into "catastrophe mode," where they see nothing but all of the possibilities of what could go wrong. They will berate themselves for things which they should have done differently, or duties which they failed to perform. They will lose their ability to see things calmly and reasonably, and will depress themselves with their visions of doom.
Hahaha, I think that just described OCD. To be fair, another quote was this:
Their homes are likely to be tastefully furnished and immaculately maintained. They are acutely aware of their senses, and want to be in surroundings which fit their need for structure, order, and beauty.
While that also describes OCD, it does not describe me, a first class slob. I guess that's genetics from my mom coming through.
How about you? Have you done a Myers Briggs assessment? There are a bunch of versions online. Some people love it, others hate to be labeled, but I've found it's usually pretty accurate.