I've bee on lexapro for about 3 weeks now. The first week I had 5mg's, then increased to 10mg's. I was a little nauseous at first but that wore off. Now I feel tired during the day despite sleeping nearly 10 hours per night. I also find I'm getting intermittent headaches throughout the day. My eyes are also extremely dry during the afternoons. Are these side effects and will they wear off???