"i have been on lexapro 10mg about a week and a half.  i was on pristiq and lexapro last week to transition off pristiq &amp; had a good week.  now i&#039;m just on the 10mg lexapro and feel nauseous, have no appetite, increased anxiety, and very depressed.  i am hoping this works for me better than the pristiq but i&#039;m worried i made a mistake.  will these feelings pass?"