You can use a Tibetan practice called Tonglin, which means "giving and taking."
While in meditation, visualize some aspect of divinity (Christ, Divine Mother, etc), and pray for their help in this practice. Pray that it be done according to the will of God and in accordance with karma.
Visualize the suffering person, and visualize the presence of that divinity, who will facilitate the practice.
With each inhalation imagine taking from the suffering person their pain, illness, discomfort, sadness, fear, etc. and you take it all upon yourself.
With each exhalation, you give to them all of the good things that you have: happiness, joy, peace, serenity. Radiate light upon them.
Therefore, by the grace of divinity, you take the suffering of others upon yourself, and transform it.
There is no danger in this practice. It has been in use for centuries in Tibet and has been thoroughly investigated by the instructors here.
"Do not worry; cultivate the habit of being happy." - Samael Aun Weor