Sleeping excessively is a symptom of depression, along with all the other things you describe. I would definitely stay on the Lexapro and allow them to up the dosage. They always start you out on a lower dosage, and almost always have to up it. It takes 2-4 weeks for these types of meds to build up in your system to a point of helping you, and you are just now at that point. I can almost guarantee you, that if you stop taking it, you will spiral downward. Your body is telling you that you are depressed, you have all the classic symtoms. I've been on Lexapro for several years now, and have found it to be extremely effective. I've been through all the same symptoms as you with depression, and have researched these types of meds a lot. You say you are feeling better now, probably due to the Lexapro. Give it a chance.
i too was put on lexapro for ppd and anxitey attacks after my second child. it did wonders afte a few months i was back to my normal self. i stayed on them for about one year. i recently gave birth to twins and the symptoms are back again so there is times when it could possibley return but i am hopeful the meds will help me again