Actually the Graston technique shouldn't hurt that bad. Check out the college I went to - they use it and they are cheap. Out of the way and slow, but cheap.
Muffy, cortison used to be the treatment of choice, but now is more of a last resort. Cortison only helps stop inflammation, but it can liquify surrounding tissue. Good if it's inflammed...bad if it's already necrotic (dying) tissue. I assume they know what they are doing, but beware if they keep doing injections...very dangerous. Maybe this will nip it in the bud, let's hope so.