The thiamine made such a difference in my life that i haven't been willing to stop taking it. I am looking for other avenues because I don't want to face the life had before taking the thiamine.
So I thought about this for a while, and I remembered that when I did the ketogenic diet (no carbs) my fatigue would go away entirely as well. Doing a little wikipedia reading on the thiamine page:
The enzymes which are dependent on thiamine pyrophosphate are associated with the citric acid cycle(also known as the Krebs cycle), and catalyze theoxidation of pyruvate, α-ketoglutarateand branched chain amino acids. Thus, anything that encourages glucose metabolism will exacerbate an existing clinical or sub-clinicalthiamine deficiency.
So thiamine is needed for sugar metabolism, hence if you eat no sugar and your body learns to rely on ketones, then the fatigue should stay away even if you decrease your daily thiamine.