Infant sick?

Serenity

Today my 7 week old has been crying so much and we just couldn’t get him to calm down, then he had a 5 hour nap (very unusual for him), then tonight he isn’t really eating, and he has only a diaper on and is DRIPPING in sweat. We even turned our heater down to 65 and he’s still soaked. What is going on?

P.S. He doesn’t have a fever. I’ve checked multiple times.

Update: He has a virus 🥺