Hi Trinity,
My husband is a person with Asperger's so we work together a lot on mutual communication.
You mentioned in your post,
"I do care, but I lose my ability to be properly social when I have other sensory issues on the go as well."
If I heard these words from my husband it would mean a lot to me. Personally I would rather hear those words than have a sympathetic facial expression. It would also help me immensely to know that you are hungry and have a headache, but that you do care. Maybe your husband could learn that your facial expression isn't a good indicator of what's going on inside.
JMO as a spouse -- your hubby may be different. Enjoyed reading your perspective. I have some experience with facial expressions getting in the way -- both mine and husband's.