Too much B6! Really... most people don't need nearly this much.

Most people should stay at 100mg or below.

PN does fluctuate and the body adjusts to the supplements some.
(just like it does for many drugs).

Also too much Vit C may cause some acidosis...which your body has to cope with. (unless you use Ester C form).

Probiotics may cause a die off of the nasty bugs in your GI tract that you may harbor, and that die off can feel pretty yukky.

Another way to improve stamina is to try d-ribose. Start at 2.5 grams at night for a week or so and see how you feel then. This sugar does not act metabolically like glucose, but does help synthesize adenosine...this is the base for ATP, AMP, and ADP which are made in the mitochondria for energy transfer. Adenosine also improves fatigue and muscle pain in chronic fatigue and Fibromyalgia. I got up to 7.5grams a day...and that took several months. It is a slow supplement, but very nice when it works. You buy the powder and mix with juice or even water...it has no unpleasant taste at all. In the beginning it may cause sleepiness, and this is because adenosine outside the mitochrondria is the sleep signally compound we use to go the bed at night.

I would definitely stop the high B6 intake...this can be very complex because high B6 causes another type of neuropathy! The only supplement that deficiency of or excess of gives neuropathic symptoms.