I presume you mean pyroluria not porphyria.

This clinic will test for pyroluria and offers treatment as well.

https://www.integrativepsychiatry.net/pyroluria.html

https://www.integrativepsychiatry.net/kryptopyrrole-test.html

This reference is by a PhD, not a ND per se, but in it looks like will give you the kind of information needed as background to ask an ND to see if they're competent to treat you.

Since I don't want to look like I'm touting his book ($40 +ship) and I don't know him nor have ever seen him, I have just copied here within double quote marks from his main page.

Any Search engine little known function is if you enter into the typeable window as a search term the exact copy/paste string from any website, BUT THEN PUT IT INSIDE DOUBLE QUOTATION MARKS, the search engine will find that exact page.

"If you became very sick, and/or very reactive to foods, chemicals or EMF after mercury, pesticide, mold, or other toxic exposure, or after a Candida, parasite, viral, Lyme, or other infectious problem, a worse state of (previously hidden) porphyria may have been induced.

Porphyria is NOT a “rare disease,” rather 20% of Mankind may have a porphyria genetic defect that shows itself after stress, toxic exposure, drugs, or micro-organism—Candida, parasites, bacteria, viruses—overgrowth.

Once the porphyria is active, some people then become chronically ill, and/or very “allergic.”

Porphyria may be the ultimate cause of MCS/EMFS/E.I./Universal food sensitivities , and numerous common, chronic illnesses--see below. Journal articles detail that tests for porphyria can be inaccurate.

This book also shows how other theories--including the nitric oxide, Vitamin D, neurotoxin, and pyroluria theories--are sub-sets of the Porphyria Hypothesis, and are superseded by it. Even explaining why "helpful supplements" make some people worse.

This is the first and only holistic or integrative book published on porphyria.
Besides Porphyria, 10 other conditions that can cause or exacerbate Chronic or Environmental Illnesses are leghthily discussed. Unique Rochlitz theories."

There's also this interesting piece:

● Hiatal Hernia Syndrome and Vagus Nerve Imbalance—with corrections. The 21st chapter is also our new, separate Hiatal Hernia booklet. Thus making the Porphyria book an even better value.