Aricept and memory

After a year and 8 months on 10 mg. of Aricept for AD, my mother's loss of appetite became so severe she almost refused to eat and experienced frequent gastrointestinal upsets. After stopping Aricept about 2 months ago, her appetite improves and the upsets are less frequent, however, in the last two months her memory seems to be declining rapidly and she wandered away from home in the night.

My mother is taking aricept, effexor and remeron as prescribed.....her confusion and memory lost seems to be increasing at a more rapid rate. Could this be due to the combination of drugs? Should aricept be combined with two anti-depressants?