I’m so sorry to hear that! Let’s send healing energy his way! 
Here’s a spell shared by SilverBear which can be what you’re looking for: Healing From A Distance! 🌏
Another way of sending love and light to a friend is with a dedicated prayer such as this: Wiccan Prayer to Bless a Friend.
Recently, I also posted a spell with rain water to send healing to another person: Pain healing advice - #2 by Francisco
I hope this helps! 