I would not assume that he is avoiding returning your email. I remember once right after my abuse issue unexpectedly surfaced in therapy. I was shell shocked and shut down and refused to talk about it. A day later I was a mess and wanted to talk. I emailed my T for an appointment. In my message mentioned that I was struggling and if possible wanted an earlier appoint. The email went unanswered and this sent me off the deep end for next two weeks. All kinds of thing went through my head during this time. I almost didn't go back. When I did go back my T blew off my email and by saying, "I got your email message but I had no earlier appointment available." Maybe my level of distress was not adequately conveyed in my email, then again maybe it was. If my T had responded, I would have been balling like a baby and likely a lot more dependent on her. I think sometimes things happen for a reason. Maybe the delay in addressing this issue serves some purpose.

Sunrise if this issue is important to you then keep raising it. You will eventually get it resolved.