I can throw in my experience .
I gave up sugar caffeine alcohol and empty carbs for 2 weeks ..I have regained some of my balance and I’m needing not as many pain killers but continuing with the same dose of Endep.
I haven’t had this condition for very long so I’m not certain that this improvement is because of a diet change or it’s just improving on its own. I assume the only way to tell would be to do a challenge diet eating all those foods again and monitor the results. I think this diet is worth a try though..not much joy in it but if it offers some relief it would be worth it