Well, I have a couple of comments.

1) if you DO have damage in the dorsal roots, there is not much you can do about it. Ability to repair this damage varies genetically from person to person. Healing is all one can expect, as there are no RX drug treatments for it.
Symptom reduction (palliative care) is all that is available.

2) But if your doctor suspects, autoimmune factors, then methotrexate is one drug he/she may try.
Examples of conditions that are autoimmune are Sjogren's and
lupus.

One cannot really control doctors... or force them into anything IMO. They do what they do and that is that.

I would consider those chronic UTIs however, because many drugs that treat these infections can cause PN. Doctors are not going to support this contention, because they typically ignore and avoid any culpability and will not blame other doctors or testify against them. IBS can result from deranged bacterial flora in the gut, which comes about from multiple or long term antibiotic use. So when patients have multiple medical issues, and get various treatments, the situation may become what is called iatrogenic---doctor caused. Doctors consider this a consequence of treatment, and typically do not explain this to the patients. Also this is termed benefit vs risk. In general the doctor makes this decision and typically does not involve you.
At times they may inform, but many times they do not.