How will I sleep tonight?

He’s 18. I took him to the ER this morning with a fever of 103. He was very weak and he felt like he was going to faint. His BP was very low and his heart rate was very high. They took all sorts of tests and Covid came back positive. They were on the fence about putting him in ICU or intermediate care. His bp raised slightly enough to downgrade him to intermediate. Since he’s positive he’s not allowed any visitors. They made an exception for me to stay until 9pm tonight due to my son’s anxiety. I hated to leave him and now I’m home. My mind won’t quit. How can I rest?