Indigo ray or green ray?

[anagogy]

So these two rays are the most effective in healing, or alleviating different kinds of pain.

Which one do you feel is best for you (according to the configuration of your energy body) to utilize for healing and energy work, rituals, ..?

I always use green ray. but just some minutes ago I used visualization+breathing techniques to channel indigo ray chi from my sixth energy center to the area that was hurt and it really felt it got instantly better.

Still I may have hypnotized myself to make it feel better.  

The lighter energies control the grosser energies. So whichever energy field you are most efficaciously able to access can be used to correct a distorted manifestation (at a lower level of manifestation). But all distortions have an origination point, if the ultimate source of the distortion is at a particular ray, one energy center can't correct the distortions of another energy center though it might temporarily alleviate a particular manifestation of the distortion. Sort of like you can take a pain pill to temporarily alleviate a pain in your body but it isn't going to correct the internal mechanism ultimately causing the pain.

If the source of the distortion was merely a surface level (physical) distortion, it will remain corrected. If there are deeper metaphysical sources, the distortion will find a way of eventually remanifestating until it's ultimate source is divined and correctly balanced at its own energy level.

This is just some general information to aid your conceptualizations of how these energies interact with one another.