Hello again Isis1,
Reiki can be used for anything. Some conditions might heal rapidly. Others might take awhile. Some might heal physically, others might be spiritually. All occurrs for the greater good of all. The key in doing Reiki is not to focus on the outcome of the session but to focus on your intent in giving Reiki. For example, when your giving Reiki for a headache, are you looking for the headache to be gone after the session or are you giving Reiki so as to share what you have and not be looking for anything in return? A healing will occur but not in the way we expect it.
Remember, it's not the destination that is important, it's the journey getting there that is.
Amen to you always,
Archangel