Benfotiamine effects gone after 2 weeks... Why?

One day I'll open a longer thread talking about my case.

Let's summarize it to: years of oscillating anxiety, and lately a growing baseline anxiety which has removed a lot of joy from my life. I've tried it all --always legal, and always prescriptionless. I have not wanted to go down the path of benzos & so on.

I started taking benfotiamine without much hope, thinking to myself: bah, another stupid supplement like so many I've tried which will do nothing.

Well, I had the best 2 weeks in many, many, many months. Like a dream! I felt so great I even felt angry I'd lived the other way.

Today I'm back more or less where I was. Why?

I know myself enough to know this was no placebo.

I've been co-supplementing with magnesium citrate, but just that. No other vit B.