First of all Jenny, I'm so sorry that you are struggling like this! I honestly understand.
Secondly,even though she's your twin, you can't compare your healing to your sister. There will still be some genetic differences as well as some differences in how you respond and what infections you may have.
Because you had the same basic reaction to Cowden's as you did to the rifampin, it's not the medicine or protocol, but your body's response to treatment.
No, I don't believe you can look at your vitamin B levels to determine if you have a MTHFR issue, it takes a special test for that, but your health insurance MAY pay for it.
In my opinion, it likely a whole body overload of toxins, not just one part of your body, which us why your symptoms included so many areas of your body.
But your reaction to the Epsom salt bath is why we advise only warm water or using a foot bath only until you know you can handle the full body soaks. I can't use the full body soaks without extreme herxing either. But I can easily use the foot soaks.
Herb only treatment for Lyme & Bart ended 12/11 - no active symptoms for 2 yrs -Herb only treatment for Babesia ended 12/12www.healingwell.com/community/default.aspx?f=30&m=2977364
Had Lyme, Bart, Babs, RMSF, Ehrlichia, Myco, Anaplasmosis, EBV
New Lyme case 8/2014 - Healed 1/31/15 - unknowingly had Asymptomatic Babs and Asymptomatic Bart, being treated now though (2/2016)