Barb, the anti-depressants are a classification or medication that one really doesn't want to play around with. For the selective serotonin reuptake inhibitor (SSRI) Lexapro, 10 mg is considered the lowest therapeutic dose to be taking. It is doubtful that the 5 mg you are taking, would be helping you much, in fact, at lower than therapeutic doses, the body may end up rejecting the medication all together. Also, one should never play an up and down game with anti-depressant. In other words, one should not increase the dose when things get a little rough, and then back off on them again.
Anti-depressants work by encouraging the growth of new brain cells in the hippocampus region of the brain. Cells in this region can become damaged or destroyed by stress hormones that we produce, such as cortisol. In order to stimulate this growth, one must take a certain amount of the anti-depressant prescribed.
I would really suggest that you consider going up to 10 mg on the Lexapro, and staying there.
As always, the very best to you, Barb!... Chuck