Well, a couple of things.... First, you say that your T always answers your emails, but that she hasn't written back this time. I think everyone needs a pass every once in a while. You say yourself that this is a one-off instance. So, I think that you should have a little more grace for her. Second, I read what you wrote, and it sounds rhetorical. You aren't asking any questions or for any advice. You are just giving her an update and stating that you should have listened to what she said. So, it is not actually an email that would necessarily warrant a response, in my opinion. Therefore, I really wouldn't read anything into it. I'm sure that your T cares.

As an aside, I'm sorry that you're having issues with your heart rate and hope that you can get it all resolved.