Increased anxiety is a very common side effect in itself. The fact that you don't have any other side effects is a good thing and may mean that your body will respond very well once the initial added anxiety subsides. If it does not subside in a few more weeks, then you should probably investigate the dosage or possibly a different medication. It's all trial and error when it comes to this stuff. It took me about three weeks to adjust to Lexapro, but all in all it has helped.