I have been on Lexapro for 8 days now (10mg), will be increasing ...

I have been on Lexapro for 8 days now (10mg), will be increasing to 20mg at day 14. I was previously on citalopram and then Cymbalta. I am having a hard time adjusting to the lexapro, I get frequent "head rushes" and feel dizzy and/or nausea for a good part of the day. This makes me not want to do much physical activity (like the workouts I so badly need). I know this is a common side effect, but has anyone who experienced it in the beginning, noted that it went away after a period of time?