how to communicate

ADHD spouse is at parents' house for long weekend.  He has been going almost every week for a year; he helps them out.  I have expressed my desire for spouse to communicate with me periodically while he is gone.  Occasionally, he does.  This weekend, Thursday to today, one communication; he sent me a picture of the beets he cooked for his parents for supper.

What is the ADHD-appropriate way to communicate to my husband that his not communicating bothers me?  It seems that if I say anything, I am nagging; if I say nothing, he assumes that all is A-OK.  If I say that I feel sad and lonely when he doesn't communicate with me, he says that this makes him feel guilty (and I've been told repeatedly that guilt paralyzes his brain and thus his ability to do anything).  Any tips on this situation?