Look into respite care services in your area. It's not a bad thing to hire a professional to take over a few tasks and give yourself a break every once in awhile.
www.care.com has every kind of caregiver you can imagine, including special needs professionals, and they do background checks, the whole nine yards. It's a bit pricey to sign up, but once you find someone you like you can work out an agreement between the two of you and cancel the membership again.