I was a respite worker in Canada through the end of my high school and college years. I was neither abusive, neglectful and went out of my way to ensure families had undue stress. I did not work through an agency. I had a lot of work.
My Mom also tried using respite or care workers and found them unsatisfactory (except for me, who allowed myself to be bossed, overworked and belittled - I was a goodist).
Why might it be so hard to allow people to help?
Perfectionism.
My Mom also has TMS and a perfectionistic personality and when people didn’t do everything her way and in her time she got stressed out. Granted, some staff sent were not great, but it was an opportunity to get out, have someone different talk to my Dad for a few hours. Her stress couldn’t let her handle even this.
I would use some TMS techniques to help recognize where and when perfectionism might come up in your life, your need for full control, and how that has impacted your ability to feel like you can let go, even for an hour or two. Your brain needs this even if your TMS mind tells you every reason for you not to feel safe in letting go.