Hi Angela, if you live in Harris County, please click the link below for information on qualification requirements for tax exemptions. There is a disability exemption in addition to the regular homestead exemption. There are time limits on qualifying though. As the link below states, "Deadline for the disability homestead exemption: you must apply within one year of the date you acquired the home if you were disabled at the time you purchased the new property. If you became disabled after you acquired your home, the deadline is one year after the date you became disabled."
You may want to call the Harris County Appraisal District for more information: (713) 812-5800. Hope this helps!