ANYHOW, I'm wondering if this experience sounds familiar to anyone. This whole thing is really upsetting me. T says that we will welcome whoever shows up - that they have good information for me, and I have good information for them... but I don't know, this is hard and it's really making me panicky and sad and ashamed and sick.

Yes, totally familiar. Most of my alters revealed themselves through writing, some directly to T, others actually allowed me to see them in my mind's eye. The may not make any sense, but it was like an inner vision, or flashback, kind of and while they usually didn't speak, they werew animated, or moving. Actually, two of them did speak to me. One answered the question, "What are you doing?" and the other cursed. He didn't realize at first that i could see him and it really surprised him. He blinked out as soon as he saw me looking at him, but swore in shock before he disappeared. It was pretty funny, actually. Some guided me as I thought about them, to create a sketch. It can feel scary and upsetting, but it can also feel comforting if you embrace them, accept them as part of you, parts that need you. It doesn't have to be all frightening. And i don't feel there is a "me" either. you're not alone. take heart from the support here - it helps.