You know, after my mother passed. The next morning I thought, well, maybe they had the wrong person, because I had called up the nursing home once and they had my mother confused with somebody else. So last night I was thinking, I wonder if my mother is still alive. It was a closed casket gravesite burial, since I am the only family basically. So I started to doubt if my mother was dead! Is this a part of grieving? Thanks.
Take your time, and grieve at your own pace. Don't let anyone tell you that you need to "get over it" - this is a process that happens differently for everyone.