I am so sorry that you are going through this. I am going through (have been going through for quite some years) a very similar thing, but with my daughter, my only child. I don't know what to do either. She has no concept of respect for me. Several times I have considered just cutting her out of my life, but that would only hurt me - I think she would be relieved. I have 2 grandsons whom I see maybe twice a year - whenever my daughter needs a babysitter while she goes on vacation. They live a little over an hour away, but just can't find the time to come see me...the time on the road coming and going is just a waste of time they can't afford. I do not have a car, so I can't make the drive there.
I wrote a post about this but it hasn't been posted yet. I hope you and I both get some help from here.