My pet lion head bunny looks very very sick and my vet is on vacation. My bunny normally hops around and eats a lot and drinks but he is not moving at all just breathing heavy, I don't know how to help him, can you give me any tips so maybe he has a chance to live through the night?

Optional Information:
Age: 2; Male; Breed: rabbit/ lion head bunny

Already Tried:
hand feeding and cutting carrots. /p>