Robb,
You're not complaining, you're desperate for answers to a difficult situation you see no way out of. You deserve a life too. Adults do go out and play...its called vacation or fun! I myself vaguely remember what that is...but both of us need to "cut loose."
You're intuition is dead on. Your Mom isn't going to change so you are deciding to break the "cycle of demanding." I'm offering you the advice my doctor offered me.
Start using "I Statements." Instead of her demanding, counter her with "I cannot do that right now, but in such and such time I can." Its important to start with "I" because it deflects her demands. Never do something you don't feel up to doing, because it takes away from who you are and saps your energy. Here's the tough one...stay consistent. You cant be wishy-washy because she will then know how to strike the nerve that works in her favor.
Here's what I started doing... I would say, "I am going to vacuum or dust. It's gonna take me about an hour, how about after that, I take a break and we can have coffee/tea etc..." Unbeknownst to my Mom I would break for 10 mins then get up to do another task. I did this by saying, "Im not getting my chores accomplished by sitting here and enjoying your company so much! How about we meet again in another hour or so when I'm done.?" This worked well because she had my attention at the same time I could get done what I needed to do. If she would make a demand, I would tell her why I can't be with her just yet..."I'm not finished with the bills...or Im concentrating and getting the task done so I can be with you (this one worked wonderfully well).
Is it possible for you to ask your kids for help with "Grandma"? Perhaps you can tell them how important it would be to you for them to be with her, to make a memory of being with her. She sounds like she is lonely and could use some company. I don't know how young your grandkids are, but could she read them a story, color with them, paint by number with them or do some cut and paste? Perhaps it would help you if your kids understood the situation, and that you just need some time to yourself. Start small, perhaps taking a hot bath and/or a nap. Or retreat to your room so you could do something you enjoy yet you're right there if something happens. Have your kids watch Grandma while you and your husband go out to dinner etc.. if thats possible. We had a situation in our family where grandkids couldnt nor wouldnt help with an elder in the family. When the elder died, they said, "youre right, I shoulda spent time with.....while I had the chance. I wish I knew who they were, and what part of me came from them. Anyway, I digress...
You can also find out if there is a senior day care center near you. Perhaps your Mom would enjoy being with people her own age. She may react like a little kid on her first day of kindergarten, kicking up a fuss but in the end she may enjoy it too especially if she finds a friend. Where I am, we also have a community center that caters to seniors. They have bingo games, dances, luncheons etc... I don't know if your mom can be left alone, but if so, let her know that you need to go to the store (for example) and give her your cell number (if you have one) or a neighbors phone number. Or perhaps, a neighbor you trust can stay with her for a bit while you do the shopping, albeit its mundane but its a start. Your Mom sounds insecure she may need you to show her you're there for her, but you need and deserve a life too. You don't have to cut off your life to meet her demands.
Everything starts in small baby steps...but she will adapt. At first she will "buck you" she won't like it because you are taking away her power of demanding (which is what works for her to get her own way) and returning your power to you, which is where it belongs.
You are not selfish for wanting time alone with your husband. Thats what husbands and wives do...they spend time together and have fun! Especially when your time together is so rare... its just as important to have time alone to find peace, whether it means you meditate, do yoga, stretching and meditating works for me, as does gardening. Everyone finds peace in their own way... Find your peace.. For me, it meant outwitting my mom by getting up before her, or going to bed after her...whatever works for you.
I wish you much luck...Let me know what happens...
Sonni