yep, I've felt that way several times, like a robot just doing routine things without any feelings/emotions whatsoever. of course the actual reason would only be known to a psychiatrist.
absolutely. When I have had certain depression it feels as if my head if stuffed with cotton wool that I cannot think around. It feels like your brain kind of stops working. Sometimes I got nothing in there at all, and of course that makes you emotionally numb I assume which is another problem.
All I can suggest is to try to ride it through with help and medication and it will pass as most things do with bipolar but it may take time...