I don't think all of these symptoms are rooted in the week long test of SSRI, but anything's possible. Research detoxing methods, a great book by Bruce Fife Detox offers many methods for detoxing. Another thing you may be deficient, expecially with the sleeping problems is magnesium, try 200-400mg of mag citrate, wow, I missed it for a few weeks and my sleep was a real mess. I'm recently coming off sertraline/zoloft so i know that icky zombie feeling. I'm investigating /r/Nootropics to get things back up to speed. tons to learn, start with the sidebar over there.
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As far as suspecting brain damage, sad to say, I've been there. I had a tooth extracted 2 yrs ago, got nitrous, maybe too much, I had that numbness physically and emotionally for a few weeks. I coudln't taste food, my nerves were completely dulled. It was really scary. Doing more research, nitrous can mess up the b12, so I took a bunch of b12 daily for a month or two and that helped.
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you might need to do a bit 'o googling to get to the bottom of this, any shrink will say it's not possible. amirite?