If she can help you, then maybe you should go see her right away...

[She got the worst of his wounds to heal enough to scar once; surely she can do it again, can't she? Mephisto might be attempting to cover his tracks right now, but Yona isn't giving much thought to her own questions. Mostly because it would be really terrible to get focused on asking them instead of making sure he gets the medical attention he needs.]

Definitely before it gets to the point where your pain becomes more difficult to bear than it already is.