Healing takes lots of energy, and healing spells can really take time under that circumstance. The following spell must be done on a regular basis in order to work. Anyway, here it is.
Visualize white-gold energy in and around yourself. Now visualize that energy wherever you need healing, and affirm "my (name where you are injured) is perfectly healthy". Affirm this in your mind 5-10 times. Remember, you must do this on a regular basis because healing takes a lot of energy.