Mounting medical bills can cause great concern. If an insurance company says it won't cover treatment for lymphedema, talk with your hospital's social worker regarding how to file an insurance appeal. He or she should be familiar with federal laws that support lymphedema treatment, as well as how to file with insurance for such procedures.
Whenever either of these is done, it should be done on your unaffected arm. If both arms have been affected (such as post-surgery for a double mastectomy), then request that your blood pressure be taken in a lower extremity OR in your nondominant arm. (If you're right-handed, then your left arm is your nondominant arm, and vice versa.)
Many support groups are available to provide encouragement, tips, and friendship. Ask your hospital social worker or oncology nurse to help you link up with one. In addition, check out books such as Living Well with Lymphedema by Ehrlich, Vinjé-Harrewijn, and McMahon, 2005.