Is there a difference between social worker or case manager?

How do you locate one? Do they help or harm?
My mother is 90 y/o and I will be going back to work. She lives with me, there is no family left to care for her except me. I suggested we get a care companion or someone to come in during the day to check on her. I will be gone 9-10 hours a day. She said she will not allow someone to come in the house, she's perfectly fine. She has forgotten her CHF meds 3 times in about a week. She sleeps all day when she's to take the meds. She is a bully, I have lost control of my life/house. I'm going to counseling to seek some help from the stress and to work thru some of the issues. For awhile she would threaten me that she was going to call the police because of abuse. I told the doctor about it on one of her visits with her there. She told him I make things up. It quit for awhile, but again today she said she was going to call 911. I will not allow this in my house. I made a call to senior services to see if I could get a case manager or some third party her to help and protect myself. I am not abusing her in any way, in fact I wait on her hand and foot, it's never enough. I've had enough...