I noticed my 1 year old male indoor cat wasn't quite himself this afternoon when working from home - he usually drapes himself over my keyboard asking for attention, but he had stayed hidden under the clothes maiden (his favourite spot). Didn't think much of it til I came home at 6pm after dropping OH off somewhere and he didn't sprint to the front door as he usually does when he hears it.
Spent the evening watching box sets and then fell asleep on the sofa - woke up now and he's still under the maiden, just not quite himself. Could be persuaded to look and swat gently at (but not chase like a lunatic) the laser pen, came downstairs for biscuits when he heard me shaking the bag but then didn't actually eat any, I picked him up and he didn't make any noise so no obvious pain... But he's still under the maiden and just looking sorry for himself.
Checked the litter box and no diarrhoea, and he doesn't appear to have gone anywhere else. Google obviously ranges from 'see if he's okay tomorrow' to 'vets, now, he's got liver disease'... So as it's 4.32am, if you're up - what should I do?