OP- the metal tongue depressor thing was probably Graston, can be an acceptable tool for breaking down scar tissue, however that should've been started prior to 3 months out, too late for you now, but you may want to see someone who treats it routinely a sports chiro certified in active release technique, or that has taken both of the graston modules, and isn't just scraping away. You have to be sure though that you're stretching and doing exercises so the new collagen lays down in a pattern similar to the stresses in the area.
The injection LSU is talking about is called prolotherapy, typically it's used in cases of chronic unresolved inflammation, and it basically is like hitting the reset button on the inflammatory process, in the hopes that the body will completely heal. The solution itself doesn't break down the scar tissue, but when treated in association with ART, Graston, SASTM, etc the scar tissue will break down and heal more easily.
As far as having an additional surgery to remove scar tissue, there are few surgeons that will do this, especially when a competent manual therapist (chiro, pt, etc) can fix it