Is there any natural treatment for Porphyria?

There are no "natural" treatments outside of maintaining a healthy diet that is high in carbs. There is speculation that rich green foods, such as wheat grass and kale, things that are heavy in chlorophyll, are good for those with porphyria as it can act as a heme replacement, but there is no official research on the matter.

Not as far as I know of. I have even found that eating healthy foods and exercise improves my overall condition

AVOID TRIGGERS, INCREASE GLUCOSE IN TAKE, REST AND PAIN MANAGEMENT

There are treatments aimed at managing the condition. Many with the Acute Porphyrias will avoid drugs including over the counter treatments for colds or flu because that is often times the trigger, thus looking for alternative or complimentary medicine is sometimes made use of. Again one needs to use caution, just because something is natural or herbal does not mean its safe. Many herbal medicines contain powerful plant ingredients which have chemical compounds similar to those used in drugs.
Aromatherapy can often be used, however one would need to consult with a clinical Aromatherapist who will do an essential oil profiling to find the most suitable essential oil to recommend based on a thorough medical review and approval from your medical team.