It's definitely time to head back to your T, even if it's really hard for you.

School is really hard. It's a very stressful environment, and it's ok that you're struggling.

What has helped you in the past? I tend to go back to my past experiences and remind myself of what helped me get out of the depression (or, at least, what helped me function even if I felt like dying). Like... for me personally? It was forcing myself to do the basic things that I knew I needed to do - going to class, eating a meal, having a shower... etc. I might not have felt up to it at all, but I would do it anyway. Sure, I might go to class and not pay the slighest ounce of attention to it... but at least I was there, right? And eventually I'd start to pay attention to little bits and pieces until I found myself more able to participate. Can you find a way to force yourself into doing something, despite how much it might pain you to do it?

It's good that you've came here to talk a bit, that's a start right!