Archangel Raphael is the minister of healing and he is waiting only to be called upon in order to contribute his healing energy to you.
Archangel Raphael is associated with the color green. The light he heals with is a deep emerald green and his vibration matches that of the gemstone emerald. If you want to work with him in healing yourself or in your healing work with others, you can imagine his green light surrounding the person or part of the body you wish to heal. You can also use emeralds (raw emeralds are less expensive and work just as well) to direct the healing. Just keeping an emerald with you can keep Archangel Raphael’s energy with you.
When I have worked with Archangel Raphael in the past, I have seen him literally insert a cosmic IV line and pump his emerald light into the person, so it is traveling throughout their whole body through their circulatory system.
Here is a version of a very old prayer that you can pray when asking for Archangel Raphael’s assistance:
Glorious Archangel Raphael, wonderful prince of the heavenly court, you are illustrious for your gifts of wisdom and grace. Considering that you are the “medicine of God” I humbly ask you to heal any infirmity of my spirit and whatever illness that afflicts my body. I especially ask of you the favor (here mention your unique request), and the wonderful grace of your purity to prepare me to be the temple of the Holy Spirit.
You can also simply speak to him requesting his assistance, as he understands our intent, whatever the words we use. Archangel Raphael’s healing very often manifests instantly, or you may receive a message of specific actions (like seeing a certain doctor or holistic health practitioner, for example) to take to assist you in your own healing. You can call upon Archangel Raphael at any time. He is just waiting for you to give him permission to perform his healing works.
Source of historical information: Wikipedia.org