Every person is different and I'm not a psychologist, but it's my opinion that it isn't necessarily bad to "shut down" for a while. I think it can be a useful rest for the mind and body. My therapist concurs, as long as it doesn't develop into full-blown disassociation or last too long or become too frequent. What constitutes "too" probably depends on the person. Personally, I have had several episodes of "not caring". They weren't intentional - I just "found" myself there. Then, slowly, reality started to set back in. At those times I really do believe I was near a breaking point and needed some time to feel nothing. People used to tell me to take care of myself and I would get so angry and think "I don't have time to take care of myself! Don't you see what's happening? I need to fix this. I'll take care of myself later." So I think the shutting down was my body and mind taking over for me and forcing me to rest when I refused to let myself. Eventually, my situation resulted in me truly "not caring" and withdrawing from the marriage, but this felt much different from the previous episodes. So sorry you are going through this. At the risk of making you angry, please try to take care of yourself and if you find yourself not caring for a while, try to be grateful for the rest. Just my two cents. Hugs to you.