Autoimmune

>- machine only goes to ~2200 hz.

It should provide good frequencies. What brand / model is it. There are machines out there that may look good but can be incredibly bad due to inaccurate frequencies.

>- tried the 666 hz frequency that Hveragerthi in the Truth in Medicine forum swears by, but it did jack squat.

Again, how do you know that your machine is actually puttine out 666 Hz instead of 692 or 641?