Hi BHC... Welcome to Anxiety Zone!
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BHC, it is not unusual for an individual starting a SSRI anti-depressant such as Lexapro (Escitalopram) to have somewhat of a roller-coaster ride of ups and downs with good days and not so good days. That has certainly been true in my case. You mentioned that you have only been on Lexapro for a month, so you are very early into your treatment. Anti-depressants don't work like other medications, and generally take between 3 and 12 weeks to take effect. One will usually see degrees of improvement during that time. I am on Celexa (Citalopram), Lexapro's sister drug, have been on it for about 5 months now, and I'm still seeing improvement, and some off days as well. Keep in mind too that even individuals that don't have an anxiety disorder, also have off days.
At 15 mg, you are already on a therapeutic dose of Lexapro, with 10 mg being considered the lowest therapeutic dose. I would highly suggest that you listen to your psychiatrist, and remain on that dose. Psychiatrists are the experts in this field, and as I mentioned, you are very, very early into your treatment. If you have any real concerns, I suggest you contact your psychiatrist for directions.
Keep in mind too that anti-depressants can be a major help with anxiety disorders and depression, but they should not be the only thing utilized to treat these conditions. Therapy can be as effective as medications, and exercise and the use of omega 3/fish oil have also been shown to be of great benefit. I am currently seeing a therapist, and learning cognitive behavioral therapy (CBT).
Again, welcome to Anxiety Zone, BHC. The very best to you!... Chuck