You deserve to earn a living as much as the next man. Put a value on your skills, take your Self out of the equation and look around and see how much a plumber or electrician charges per hour. Yes … wow! Put a value on your work and charge accordingly. See what other therapists are charging to get an idea.
If someone receives a healing for no payment they will owe you karma. And if it's not repaid in this life, it will continue into the next. So clear all karmic issues now, and don't create new ones.