We have the same thing. Not with the T but still.
Keep in mind that I am talking for our system, which might be very different from yours.
Scar felt that the whole last month. Me and Waidth took a week from that but the rest of the month was someone else. We do not know who (Might be Alice) but that alter took half control of the body (half control is what we call controlling the body while still letting an alter be co-concious with the one who is controlling, tho the co-con. cannot participate in any decisions that the current concious is making, so what you explained) and let Scar co-con. it. The confusion really rose at who did it. Because we either take a 3/4 control, and 1/4th control (3/4 is taking over the body fully but nothing stays hidden, 1/4 is controlling just a body part, sense, etc.). It scared all of us and rose suspicion within the system but, from what me and Wai think, it is probably Alice/Azure so it is alright now.
Hope you find a way to that, it sucks not living your life when you want to. But you are definitely not alone.
-Evee