Lexapro and lower back pain?

I have been on a Lexapro for a year now and about 3-4 months ago I started experiencing a back pain on the lower right side. My doctor did some tests and his theory is that it might be be due to the Lexapro. My psichiatrist, however, claims that he has not seen such side effects from taking Lexapro. I decreased the amount of Lexapro I am taking, and the back pain started appearing less frequently. I intend to stop taking it altogether to see whether the back pain will disappear entirely.

I have been on Lexapro for 2 years and during that time am having extreme lower back pain!!  It is really bad while I lay on my side and is only somewhat relieved while lying completely on my back.  Can Lexapro cause such pain?

I had been taking Lexapro for about 2 years.  I took 1/2 a tablet before sleeping because it made me very tired if I took it in the daytime.  I had trouble sleeping and felt achy all over when I got up in the morning.   I thought I had fibromyalgia because I had undiagnosed pain in my joints, shoulders, neck,  hands, elbows, wrists and some lower back pain.  The worst part was I felt a tingling in my muscles and an achy, sick feeling like I had the flu.  I had lab tests for MS, lupus, arthritis, thyroid function, kidney function, etc., which were all negative.  My doctor suggested I go back to Prozac, which I had taken about 15 years ago.  Prozac made me sleepy but the pain disappeared like magic.  I have been off Lexapro for about 5 days and I have not felt this well in a long long time.