S.
There is a program at the Custer Road United Methodist Church in Plano, called Friday Night Friends. They do respite babysitting (free) on Friday nights for children with special needs and their siblings. There is a medically fragile room. The woman who works in there might be able to give you some referrals. I believe her last name is Jolly. If you call the church they will be able to connect you.
I am a speech-language pathologist, I have some clients who attend this program. I hope they can provide you with helpful leads.
Good luck! And congratulations for knowing that you need a break. Your child will only benefit from a refreshed mommy.
Best Regards,
S.