Does the dealership you work for have 50 or more employees? If so your should check to see if your preexisting medical conditions and concerns qualify you for the Family Medical Leave Act (FMLA) This law allows an employee to take off time for a medical issue or a family member medical issue for a period of time. You can continue on your employer's health insurance plan and can't get fired for using it.
Looks like you can use it for up to 3 months unpaid leave.
https://www.dol.gov/agencies/whd/fmla