Update: a month and a week into Niacin Therapy, and it continues to make a world of difference.

• Carb sensitivity. In thirteen years of low carbing, I have never experienced such a strong effect: it's like I'm taking a pill called Atkinsivation. I look at things that used to be somewhat tempting, and go naaaaah. There have been a couple of times when I've been very worn out and opt for the easy (my illness meant I couldn't go into ketosis and I have some higher carb things around.) But now, I feel just awful afterwards, and my sleep gets messed up that night. Ketosis and skipping breakfast isn't just easy; I also crave arranging my meals to be as low carb and IF as possible. The positive feedback is incredible: it's like I am tuned into what is actually going on in my body depending on what I eat.
  
• Good sleep. If i am behaving myself (not letting stress build up, not eating too many carbs, sticking to my sleep schedule) I sleep, at last, wonderfully. Even when I am out of town and sleeping in a room I've never been in before. Lots of depth, lots of dreams, waking up tingling all over because I'm so refreshed. The effect on my healing processes is immense. As I've gradually improved my health status, my sleep has gone from 2-4 hours to 8-10 hours a night, but it was still a bit erratic. Now, I can make that happen consistently, every night.
  
• Anxiety. I never realized how much anxiety I had until it went away. I was always a bit of an over-thinker, and being so sick cranked it up to eleven, but now I do mental strategies like I'm not going to worry about that now absolutely successfully. I've never been this chilled out & confident in my entire life.
  
• Resilience. For years now, I've been longing for the ability to stop "draining my reserve tanks" and actually building them up instead. This is the first time since my illness developed that I've been able to feel that this vital shift in energy handling is taking place. Something very healing is going on, with a lot of things. At least, that is the way I feel. I was sick for too long for it to turn around as quickly as I'd like (I'd like NOW please!) but it is, finally, happening at a visible rate.
  

This experience is turned me into a total Orthomolecular fangirl. I'm sure that niacin doesn't work this way for everyone. But I am convinced that everyone will find the subject of serious nutritional therapy well worth exploring.