HI and thanks for the question,
I would agree with you suspicions that you fed him to early after sedation, we often recommand no food for 8 hours after sedation.
You can give 2 tsp of pepto if you have it or 1 tab of pepcid ac
Is it really ok to give him something else even if he has had the other medication?
Veterinary Technician
Practicing Veterinary Technician for 23 years. Veterinary Practice Owner, Technician Trainer