Yes, I have had and still have ALL of those symptoms in a daily basis! Especially feeling out of the world and in 3rd person. It's called depersonalization. That is one of my worst symptoms!
Question; why have you been on lexapro; for anxiety? What are you being hit hard w/ again, anxiety? I have anxiety; in fact, I'm just now slowly getting over agoraphobia-a chronic anxiety disease. I have symptoms similar to what you listed, daily. I continue to wonder if it's my heart because of the over all feeling of "not feeling good" and the mainstay of nausea. I've had all pertinent tests as well and can only figure my physical downfall feelings are from anxiety and it sounds to me that your symptoms are of anxiety as well. I try to stay busy but more times than not, when the weird bad physical feelings come into play, I can't do much of anything but sit. The only escape I can use is the tv. And I used to never watch tv. I think keeping the mind occupied some how, such as w/ tv, is the one good way to deter your mind from the symptoms. If there are any other good ideas, I'd like to know of them. I think coming on here and venting about issues helps as well.