The United States sprinter Florence Griffith-Joyner underwent a similar physical transformation before she put the 100m and 200m records beyond reach, at and respectively, in 1988. She, too, never failed a drugs test, but Carl Lewis, in his autobiography, Inside Track, described her sudden leap from also-ran to untouchable as "a change that came too quickly for the imagination." He added: "Her physical appearance alone – muscles popping everywhere – made a lot of people wonder. Then there was the voice, much deeper than it had been in the past."
Secondly, I wouldn’t be concerned whether or not you’re shedding. Some people shed a little bit, and some people don’t — but shedding is definitely NOT always a good sign (as you know). Some shedding is normal because of the nature of the massages. However, some people also shed because they create too much friction on the scalp skin, or they don’t allow for enough recovery time in between sessions. That’s not the good type of shed. So, don’t worry about not shedding 🙂 Regrowth is possible with or without the type of shedding you’re looking for.