Yes, sister, I had that problem too; my mother died when I was 3 and that's almost the first thing my T said was that I was lacking object constancy.

It was a little complicated getting "up" to her office so she wrote me a note the first time I came and put it on the outside main door and I kept the note for over a year and finally confessed to it and gave it "back" to her, telling her I didn't need it anymore :-) She was amazed and pleased that I had kept it and used it that way so well for myself. I use to mail her cards and letters every week to help me stay/feel connected but it eventually worked the opposite direction as I didn't have to feel quite as lonely and afraid and be with myself in my unconnection between sessions so I did a 6 week "test" where I didn't write her at all but only was "with" her 100% during our sessions. It changed everything for me.