3month old son in hospital

My son was taken to the hospital 2 days ago and I need advice on how to keep calm and sane during this time. All I can think about is what happens if he doesn't get better or what if he doesn't come home. I can hardly sleep or eat. If anyone has any advice on how to calm down and keep a level head I would appreciate it greatly.

UPDATE My boy recovered quickly over the past few days and is now home. We're still keeping a heavy eye on him but he seems to be doing much better. Unfortunately he tested positive for covid 19 in the hospital but is showing no signs or symptoms and he has a follow up appointment in a week. Thank you all for your kind words.