RhoGam is a vaccine like globulin shot that was developed in the late 1960s to keep a Rh negative woman from becoming sensitized to the Rh positive blood of her fetus in the unlikely event blood mixing occurs. Rhogam works very much like an immunization.
However, some new research has shown that TENS may be effective for reducing pain in people who have fibromyalgia, especially in combination with other treatments, such as exercise. Fibromyalgia is often treated with various medications to relieve pain and improve sleep.
A TENS unit will relieve pain, you should notice immediate results, and you can leave on for hours a day and for many the relief is dramatic. There is nothing magic about Transcutaneous Electrical Nerve Stimulation (TENS). TENS machines are intended to be used to relieve pain.