As a fellow reitired registered nurse,I can certainly understand your concern about study again in a nurse refresher course and your concern cost of a refresher course. In addition, I agree with your concern about a return to the often physically demanding work of nursing after retirement.
There ARE some interesting non-nursing and (to me) health related jobs out there! I was required to retire from nursing due to health problems. After retirement , I am learning there is some adventure and some income available if one works in the non-nursing world. So far my non-nursing jobs
have included work as a staff member in a shelter for victims of domestic violence, work as a telephone solicitor asking volunteers to donate blood at the American Red Cross, and currently work as a child care provider in a day care center.
Yes, these non-nursing jobs pay less than the current high pay of many professional nursing jobs, but the non-nursing work is also much less demanding for folks of retirement age and/or folks with medical problems. Good luck to you!