The Limestone County Commission is hereby authorized and empowered to use, and pay from, the unencumbered proceeds of any and all special county tax or taxes levied pursuant to Amendment 125, Constitution of Alabama of 1901, to defray the expense of indigent health care in Limestone County, to pay obligations of Limestone County pursuant to the Alabama Health Care Responsibility Act, Sections 22-21-290 to 22-21-297, inclusive, or otherwise to fund indigent health care for Limestone County, including acquiring, constructing, equipping, operating, and maintaining public hospitals, public clinics, public health centers, and related public health facilities of any kind, or for any one or more of the purposes included within the meaning of the term public hospital purposes, for the purpose of providing hospital care and treatment for indigent residents of the county, or for the purpose of matching any state or federal funds made available for use in providing hospital care and treatment for indigent residents of the county. If any portion of the proceeds of such tax or taxes shall have been pledged to the payment of any bonds, warrants, notes, or other obligations or evidences of indebtedness, such portion of the proceeds of the tax as shall have been so pledged shall not be used for any purpose except in payment of such bonds, warrants, notes, or other obligations or evidences of indebtedness.