I'm on this website to research for my 38 year old son that has SFN. I posted on the "Stuff that works" website a question asking if people with neuropathy (SFN in particular) had GI problems prior and were prescribed PPI's (such as Omeprazole or Nexium). About 30% answered Yes.
My son definitely continues to have worse GI issues but after reading about the PPI's will not take them. He feels they worsen the neuropathy so he would rather have constant indigestion then nerve pain.
I refuse to believe in an idiopathic diagnosis and continue to try to research why healthy young people are suddenly are stricken with nerve issues.