Cosmo was experiencing pain and stopped eating and hid under the bed on Tuesday during the day and night. I took him to the vet on Wed. and they drew blood and put him back on pain meds. Within 30 mins I had my old cat back. The team at the vet noticed a big difference in his attitude because he was trying to attack them. This morning after he got his meds he cuddled in bed for a few hours. We will see how long he has to be on pain meds.
Thanks for all the encouraging words.