He seemed to perk up this afternoon, came out into the backyard and barked at the hose; he's sleeping now. Also wanted some dinner so I gave him a small amount of beef and pumpkin. If he doesn't have another attack in the next half hour I'll give him a little more when he wakes up.
I didn't give him any medication today, no Apoquel and no Previcox, so be interesting to see if that affects his levels Now I'm going to sit down and move some money around to pay for the vet tomorrow, and pull out all my insurance claims.