That's virtually a diagnosis considering your other symptoms.. I also get very sick with cilantro- identical symptoms to those i get from chelation....
As Healthyartist suggested, a hairtest might be a good place to start if you need more evidence although they are not always conclusive and require thoughtful interpretation.. for instance mercury will often be low even if you have lots of it (there are various reasons it often doesn't show up in hair) but other minerals will likely be deranged in telltale ways. Andrew Cutler's Hair Test Interpretation book would probably worth getting..