D.,
I am SO sorry that you are so distraught. I imagine some of what you are feeling is a response to a having a parent in a nursing home and what is called "caregiver burnout." There are some great eldercare counselors, services and support-groups available, so you might check into those options.
You do need to get the whole situation resolved before you act out in an angry way that has lasting repercussions. Of course, there ARE factors here that you cannot control, but I believe there are things that you can do differently. So, I offer the following quote from Olympia Dukakis in the movie "Moonstruck" with a smile: "What you don't know about [people] is a LOT." You say:
"All the moms in my neighborhood and some who don't live here, SEE absolutely nothing wrong..."
"... can't they SEE that I'm already busy as a bee ..."
No, people don't SEE. And other people are not supposed to be mind-readers and respond in a way that meets our needs, when they are not given guidance/feedback. We help others "see" our feelings when we verbally communicate what is going on inside our own heads and hearts. In truth, people don't "dump on" other people who graciously and clearly express themselves and set parameters for their own situations.
I feel that the reason that you "literally have no time to yourself" is because you have not (clearly, or at all) expressed your desires, feelings, and needs to family members and friends. Provided that you get control of your anger, expressing your own needs CAN be done in a way that is NOT self-centered, self-serving and egocentric. Please forgive me if you ARE providing them with direct communication so that they know how you feel, but do you SAY things like:
To your own grown children: - "I'm sorry. I can't keep [grandkids] three days a week this summer. My agenda is FULL. You need to look into additional (or other) childcare." Then, if you wish, you can provide some options - BUT ONLY IF these are options you can live with. For instance, many grandparents LIMIT the number of their grandchildren that they will keep at one time. You might offer to keep your grandchildren ONE AT A TIME and say, "You will only need to find care for (the other) TWO (if you choose to keep just one of the grandkids, you may want to rotate among them or find a way to the two not chosen to feel "special" to grand-mom.) Also, you did not specify whether your current "all day care, every other week" is 5 days a week but that is what I am guessing. So perhaps you could suggest an altered schedule - 3 days a week, every other week, or half-days instead of all-day, or even one full week, once a month, etc.. The point is, your own children did not HAVE their children BECAUSE they had a built-in babysitter. Responsible parents (meaning your grown children) must be prepared to PAY for outside childcare if they personally maintain schedules that preclude them from caring for their own children. It is fair to ask them to do this, either in part or on the whole. And if your kids object, remind them (sweetly) that if the circumstances don't change for the better, you COULD have a physical or emotional breakdown that renders you unable to provide them with ANY assistance.
I don't know what ages your "at-home children" are, but they need to be contributing to the house-care, both for your help now and as a GIFT to them for their future. Set up individual responsibilities, such as stripping beds and gathering towels and getting them to the laundry room; hanging up clothes; dusting/polishing furniture; cleaning the bathtub or shower (at the time they get in to use it), mopping floors; running the vacuum, etc. Yes, it will take some of your time, used differently, to teach these skills. But if I had six adopted children at home (you were party to this decision, I hope?) I would absolutely have a PLAN to engage them in making house cleaning and maintenance FUN. By doing this the right way, you will provide them with life skills that they will thank you for.
You are NEVER required to allow a child to spend the night (or day) at your home if it is not your idea! And, it is absolutely necessary that you EXPRESS the fact that you cannot be responsible to the safety and well-being of children that you did not invite into your care. So say:
To the neighbors: "As you know, I have six children to watch over. I have an extremely full schedule right now, and I simply cannot be responsible to your children in addition to my own. I appreciate your understanding and finding other places for their care." You can add any details if you wish (because you have legitimate obligations with your dad, grandkids any your own kids) but it is NOT necessary to provide rationalizations to others. If you don't feel up to the task for any reason, just say no and ask for their understanding.
Lastly, to your hubbie: Perhaps you need to reevaluate what your part-time work responsibilities are. Sit down with your husband in a healthy and loving way (I recommend after his favorite meal and just prior to good sex - lol) and discuss the business needs. Try to arrange your contributions in areas that you enjoy. And see if the schedules of what you do can be streamlined to make this task less stressful.
I do not believe that you are being "too sensitive". But I do believe that the problem is not the other people and your family members; it is with you. It sounds like the way people treat you is in response to the way you have "conditioned" them to respond. If the ability to verbally express your needs is not one that you have cultivated, you may want to see a counselor for a "few sessions" to learn to speak up for yourself in an appropriate way. Life will get better if you do so.
Perhaps the following scripture will help you smile: Proverbs 28:1 "The wicked man flees though no one pursues, but the righteous are as bold as a lion."
May God Bless you with boldness!
K.
Hebrews 13:6 - "So we say with confidence, "The Lord is my helper; I will not be afraid. What can man do to me?"