Is there a paget's disease support group online?

Several. Try http://www.Experienceproject.Com/groups/have-pagets-disease-of-bone/99046.
Breast? Paget's disease of the breast is an early form of breast cancer. There are many online forums for breast cancer and i recommend you join them. There are also local groups that meet in person, that is more personable and helpful. Check with your navigator/ oncology team. For a specific paget's group, check google to see what is available.