I think the only thing more frustrating to me than not knowing how to spell a word, is not knowing what the word is for what I am trying to say.
yes like vomiting the pain is much more intense before. yes like child birth there is a moment when she questions whether or not the pain will have been worth it and then afterwards that moment of blissful relief/ glow-y happiness that it was.
most mortals in my story would chose an easier if longer process of healing. and her Guide often admonishes her to 'take things slow' because not many people could survive the process she has chosen for her healing. all of the pain and agony of her life heaped on her at once then extracted as though it was being sucked out of her with a black hole that threatened to take everything not just what she was offering up to it while crushing her into tiny bits.
the whole thing takes alot of mental energy and concentration, and an enormous strength of will which she has used up to this point to mask her volcanic problems. now that her problems are being striped away from her, she will be free (after she recovers from the process) to use that strength of will to save her people.
so kind of an important climactic plot bit I'd rather not gloss over with "MAGIC!! all better, now go play" because the characters around her are going to react to her change with confusion and she will be forced to deal with that. I'd like the reader to at least not be confused with her 'sudden alteration' and be sympathetic to her plight at trying to describe the experience to people who werent there.