Much like growing a rose, you can't force it over night or instantaneously. What you can do in the moment (if it is physical pain we are speaking about, although this works for emotional pains as well)- be there. Be present, make them laugh.
If you are adamant about performing a spell, try something slow and steady. Crystals are perfect for healing work. Find something (or even create something) that plays to your strengths.
I wish you so much luck!