Herceptin treatment on hold

[November]

I'm new to the group. Diagnosed on 10/14/2011, had bilateral masectomy, final pathology showed Stage 2B, ER+PR+ HER2+. I started my chemo treatments on 01/13/2011, TCH (taxotere, carboplation, herceptin). Hereceptin scheduled for one year, currently herceptin treatment on hold due to decrease in heart function (last one received 02/24/2011). Has anyone experienced this? Now I'm not only concerned about not having enough herceptin for treatment of cancer, now concerned about heart as well. Also trying to do my best to take care of my six year old son while I am receiving treatment. At times everything seems so overwhelming.