Because he has other responsibilities besides you?

It seems to me that part of your pattern is finding something negative to panic about, because that gives you an "excuse" to start texting your T for reassurance and connection. I think that your symptoms are very self-serving in this way, as you use your feelings as justification for behavior that you know is not so positive. And I think the behavior may exacerbate the feelings, so it turns into a kind of viscious circle.

I think you are taxing your T's ability to connect with you. I think if you gave him more space, he'd be better able to provide you with the genuine connection you really need.