Lack of communication

My spouse, who has ADHD, spends four days a week out of town assisting his elderly parents.  Thus, I'm home alone (except for the dog) four days a week.  We have two grown children, both in college; this is my younger daughter's first year away.  So being all alone like this is really a big change for me.  I don't mind spending some time alone, but I do get lonely eventually and my husband, despite my repeated requests, has not gotten into a pattern of texting or calling me when he is away every week.  I feel dead or invisible.  I have repeatedly brought this up with my husband but he appears unable to carry the behavior (contacting me occasionally) over from one week to the next.  Now I feel humiliated when I ask him to make the effort.  Any ideas?