My late husband didn't understand either. He thought I was a wimp and there wasn't any real reasons for my complaints and lack of ability to function normally on certain days.  He was blessed with perfect health until he was 49 then he developed cancer and only lasted a few months.  During those few months he was finally able to understand pain.  His opinion of me changed radically in a short time.  He finally experienced chronic pain.   I'm guessing your husband also hasn't experienced a chronic pain that wears on a person day and night.  He doesn't understand how it can affect the heart and mind.  I don't know that there is any way he CAN understand because he has never experienced it.  Just know that there are people out here that do understand and do care.  We are in this thing together.  Are you on any DMARDS or Biologics?  I take Trazadone at night, it helps me to sleep and is a mood elevator so it's easier to get going in the morning.  It's like hope in a pill.   Ask your doctor about it.   Good luck.