has he got any other symptoms spring?
Is he listless. floppy?
Are his eyes dull or his coat 'starey ' and dull?
Is he eating?
Has he been out today? Got a bit warm? (Our Pighouse was over 25c when we put the pigs out. We opened their window and I've cleaned the bedding but it was still warm)
When my little Abby boy was ill (and died) last year he just looked meh. sittiing with his little feet together , nodding slightly, not sprawled or rolling about. Just a "leave me in peace please" look.
We did the cool place, hand feeding, Critical Care, fluids, vet, antibiotics but I think he'd already declined.
Hopefully a good nights rest will see your piggie right. Some favourite food and cool drink?