I have experienced extreme hair loss. I've been taking 20mg per ...

I have experienced extreme hair loss. I've been taking 20mg per day since Aug 22, 2009. That is when I went into Peripartum Cardiomyopathy or Congestive Heart failure after childbirth. Fortunately I have not experienced any of the other side effects. I have a cardiologist appointment this Friday and I had planned to discuss this with him. I want to know if the hair will grow back. No one seems to have an answer for that. I'm also taking Coreg (beta blocker).