Yes, parsley has some useful properties, but the strong anti-inflammatory you were on may have helped too. Endo is easily diagnosed once the doctor gets a look inside, during a surgery. Some OB/GYNs will diagnose it without performing a surgery, just based on a process of elimination. I hope you don't have endo, and am glad to hear your symptoms have resolved.
Not to scare you, but the only way to know for sure that you have endometriosis is to het a surgery. This should help with the nausea.
To get back to your orginal post, thank you so much for the help. I will have to try it.