So here I am taking Lexapro 10 mg. for about a month, previously on 5 mg. for about five weeks and taking xanax once or twice a day. This morning I woke up with the familiar panic feeling upon awakening...haven't really had the panic attacks lately just generalized anxiety. I get so scared and weak when a full blown panic attack hits...I always think it is something else like a physical ailment...I was shakey, nauseous, unable to concentrate, heady...I called my husband in tears. I do have a dental appointment later today and don't know if that is the reason. I am so frustrated... I want to go through life feeling more normal than this. I took .5mg of xanax but still feel a bit queasy and uneasy...when does this stop and is Lexapro working...how long does it take? I get heady feelings frequently a I'm not sure if it is just the anxiety or the Lexapro is making it worse...feeling very defeated. Does this happen to others.