Venting before I explode

Some family members of mine were in a terrible accident over the weekend. One is laying in ICU and has not woken up since the accident.  I have spent as much time as I could at the hospital since Sunday afternoon. The hospital is almost an hour away. My SO is upset with me bc I'm not eating well, not sleeping and very down these past few days. Last night I slept on the couch. I was up half of the night and didn't want to disturb him as he gets up really early. How in the world can I get him to stop scolding me and just let me be. He seriously doesn't get how distraught I am and why. He really hasn't had to deal with much regarding bad accidents or terminal illness. He doesn't get what it's like to have a loved one laying in a hospital helpless. Unfortunately I have sat in this seat far too often. We don't get each other right now and idk how to make this better. Of all people I need it's him. Help please I feel like I'm on the verge of just staying with family to be comfortable and not reprimanded after coming home from a day at the hospital.