I think you have two issues wrapped up in here. I think a "certain amount of consistency" is exactly what you've gotten from T. Has she shown up to all of your appointments? Tried to get you in for extra sessions if she could? Been there on time, and had you quit on time? Approached working with you in a gentle, thoughtful, flexible manner? In the months that you have been working with her, have you ever complained about her lack of consistency before? It doesn't seem to me that your T has been inattentive to consistency.

The second issue is the "mindreader" perspective and the presumption that your T must know that not replying to your text would cause you some kind of over the top emotional reaction. Because she must have known this would happen, then . . . . whatever you think she would have done, or what you think it means about her intent in not replying, etc. But it's your job as the client, I think, to let her know how this has affected you, not to assume that she knows. So, you could approach it from the perspective of, hey, T, you didn't reply to one of my texts this week, and I was surprised by my emotional reaction to it. I felt abandoned, it was such a strong feeling that I not only noticed it (yeah for me) but I wanted to quit therapy in reaction.

On the issue of consistency per se, is it possible that it is not T's inconsistency that is the deepest issue? I mean that how I feel in response to something my T says or does usually flags an issue from me either in my past or my present. So I'll play armchair analyst and ask, is there something going on right now with a person or people in your life where you feel like they are being inconsistent in how they respond to you? And that their behavior makes you afraid that they will abandon you? For me, there are times when I can notice and deal with something as it relates to T but it is too scary to try to deal with the deeper feelings that come with the same issue with someone else.

Sometimes it can also be about the past and that X behavior means this is an issue with history dogging you. For me, I've always been hyper alert to changes in people's nonverbal actions, tonal changes, word choices, and more overt behaviors. Comes from growing up in a home where I thought I could predict when bad stuff was going to happen, and that made me feel more safe. So I like consistency, a lot. And I married the world's most consistent person, which has felt like one of the safest choices I have ever made.

Anyway, I don't know if any of this junk is useful to you or not, I just thought I would put it out there because that is what this discussion is pinging for me.