Somebody tell me to get a grip please

My therapist has not replied to my messages from yesterday. Nor to the one I sent a couple of hours ago. This is not like her at all. I am sort of fine, at the moment, because I'm just going about my day pretty much as normal, but if I allow myself to think about it and wonder what's going on I'm NOT okay, because either I have finally gone too far and done something that has made her want to leave, or else something bad has happened to her. This is unfortunate, because at the minute when other things are tough, my secure and (platonically) loving relationship with my therapist has been keeping me going.

If I don't hear anything by the end of today I don't know wtf to do because I'm supposed to have a session tomorrow and I don't want to just rock up if there's been radio silence for a couple of days. If I've crossed a boundary by being in touch too much I need to know in advance so I can brace myself for that difficult conversation. And I'm bewildered if I have hurt a boundary because I've not done anything differently and she has repeatedly told me I never come near to not respecting her boundaries. But what else could it possibly be???

My God. Why the hell is it so hard??