Caregiving guilt; Am I wrong to understand that I cannot ‘supervise’ 24/7?

I hear you and mental burnout can be just as exhausting!  I too have my 91 year old mother living with me - again.  She is very independent - still drives but I'm not sure how long that is going to last.  I recently got a 2 month break and did I ever enjoy it!  I finally found "myself" and realized how happy I was with my life/friends/hobbies - just spending time by myself.  I slept a lot the first 2 weeks - I swear I almost felt like I had a small case of PTSD - always on "high" mental alert and being a single, solo homeowner who works F/T and takes care of everything - meaning  car/yard/home maintenance/shopping/cleaning, etc.  I now realize I'm NOT superwoman.  Since she's been back I resent it - I'm tired of giving up so much of my life/privacy/relationships suffer because I don't have the time to sustain them.  And I now feel like I can't go away on a weekend because I don't want to leave her alone.  She acts like I'm the only one that can assist her and that is getting ready to END!  I loaded up the house with $300.00 worth of groceries/cleaning supplies/other needs and looks like I need to go again.  She eats like a lumberjack and is tiny!!!  I'm tired of feeling like I need to get her out and about since she's by herself at my place - but then I think that is her choice.  She is so picky about any other living arrangement and it's only a matter of time until she's complaining to me about basic B.S!  Anyway - it's been a long work week and just felt like venting.  I also have a brother who lives up the  street - is basically retired and travels all the time.  Does he ever call and pick her up to go shopping...NOPE.  I'm going to find some assistance and it's too bad if she doesn't like it.  These little old people will drain you dry if you let them!  They will make you do circles and jump through hoops.  Oh yes and she even has something to say because I bought myself some new tops...from Walmart - "Well you must have bought out Walmart"...yea right.  I'm not sure if this helped Longhaul but good luck!