I'm really sorry about your health stuff...that sounds scary. I am glad you wrote to your T about it.

There are a million reasons why your T might not have responded yet. Like many others here have said, perhaps she didn't feel a reply was needed, since you didn't ask anything, or perhaps she was busy, or her internet was down, or any number of other things. Try to relax, and maybe try to find some support with family or friends right now if you need it.

It is interesting that you say your T doesn't care about it, but then you also say that she always responds to you, and usually within 12 hours. Maybe it's just me, but that sounds like someone who cares. Many Ts are very busy people, so the fact that she will always respond to your emails and usually do it very quickly makes me think she might care about you more than you are able to see right now.