Good luck on your treatment in the Marshall Plan. Though I have some reservations about Dr. Marshall (who is actually a PhD in electrical engineering and has some apparent skeletons in his closet from what I gathered), maybe his plan is valid and really will work, so let's hope for the best. If it does work for both Sjogren Syndrome and rheumatoid arthritis, it would be a boon to many thousands.
I have to wonder what might happen if some one with Sjogren Syndrome (or Rheumatoid Arthritis) made sure they were not deficient in any essential minerals and nutrients (such as iodine, vitamin D3, magnesium, calcium, omega 3s and trace minerals) and then supplemented with oleander extract (such as the herbal supplement Sutherlandia OPC), colloidal silver (and colloidal gold too in the case of arthritis), black cumin seed oil (Nigella sativa) and curcumin.
Oleander is effective against a wide range of immune disorders. Colloidal silver is effective against almost all pathogens, helps tissue repair and regenerate, and has had good success against arthritis too. Both black seed oil and curcumin are known for their ability to modulate the immune system as well as many other beneficial actions. And, regarding making sure to correct any deficiencies, nothing works the way it is intended without adequate amounts of all minerals, whether major or trace minerals, and the compensations the body makes to offset the deficiencies often leads to other problems - likely especially so in those predisposed to have certain conditions, illnesses and/or syndromes.