Chris, I am sorry you feel alone but we are here for you, especially when you vent, as we do the same.
There are Stephen Ministers you could ask for from a local Lutheran church and you do not have to be a member. They can help you with your issues and spend time with your loved one, giving you respite.
Or call Senior Services in your county and they can help you out with information and visits from volunteers.
I hope you will take advantage of the many resources sources available to you.
Prayers for your Serenity.