auto-immune bacterial nuisances...

I have had some wonderful relief from using the suggested regeme for my Rheumatoid Arthritis (andrographis & holy basil, chapparal and pau d arco for bacteria then spanish bee pollen and vit c high dose for adrenals).
This relief is in the form of a horribly swollen knee reducing faster than ever before, compared to anti inflammatories and 'usual flare up periods'.
I want to thank this forum for pointing me in this direction.
I have three questions about this -

1. How does one get these bacteria invading in the 1st place (via unclean foods, general stress related lower immunity etc)?

2. Can these bacteria evolve to become immune to these herbs?

3. How long does the bacterial and adrenal treatment need to last (until swelling subsides or indefinitely etc)?