Here is an idea that may work for you, or not.
Let's say tomatoes cause the inflammation while science says it is anti-inflammatory.
So logically, and methodically, you go on a very strict anti-inflammation elimination diet. You try it and you get mixed results. Is it the cooked tomatoes, or the fresh tomatoes.
Is it all nightshades or just tomatoes, so you try potatoes or peppers.
It takes a long time to get through all the weeks it takes to get a good idea of what you are eating and seeing and feeling the inflammation.
So to make things go a little quicker, do something that appears to be clearer. Fast completely, water only until your symptoms are not there. (people talk about how a complete fast before surgery relieves all their inflammation arthritis pain, often)
Try things one at a time and watch the symptoms.
If someone only fasts for 24 hours, then has relief of symptoms, then it might go faster to get some idea of what the problem is.
The immune system seems to over react to everything if you have leaky gut, especially proteins and mistaking those for parts of your own body. Fats are inflammatory, so just having fat with anything will cause some inflammation. That complicates everything. Anyways, if you figure out was is causing the inflammation then more power to you.