I'm glad you're feeling better. Even though there is not cure found yet for metabolic body odor, there is an opportunity to gain some control over its intensity by researching and understanding the management protocols suggested by the experts. So, I'm glad to see that you have been reading and researching yourself! :))
About the differences between Leaky gut syndrome and Irritable bowel syndrome, I am no expert by no means on either of these two topics, but perhaps some of these articles can shed some light on your question. According to Leaky gut syndrome from Wikipedia,http://en.wikipedia.org/wiki/Leaky_gut_syndrome“Leaky gut syndrome is a diagnosis prevalent in various branches of alternative medicine… can lead to increased permeability of the gut wall to toxins, microbes, undigested food, waste or larger than normal macromolecules… While many practitioners maintain that leaky gut syndrome is a bona fide medical condition… remains controversial and scientifically unsettled.” remains controversial and scientifically unsettled.