How can I get over the fear of leaving my parents with a caregiver from a non-medical home care agency?

My mother was diagnosed with Lewy Body Disorder last year.

My significant other and I (Gary) are currently full-time caregivers for both of my parents. No help from my siblings. I am responsible for all of my parents' affairs; Gary helps with everything else. This responsibility is very exhausting and time consuming for both of us. I did choose a reputable home care agency in which the caregivers are insured/bonded and CPR certified. Both of my parents are somewhat mobile and alert. My father is mostly self-sufficient. However, my mother needs assistance with toileting, incontinence, dressing, and memory issues.