This is a phenomenon called single event learning
– meaning that it only takes one experience to result in an intense, permanent emotional reaction to the trigger that caused it. It makes a lot of survival sense in the wild, when a young wolf needs to steer clear of a dangerous predator without requiring multiple near-death experiences to teach the lesson. But in our pet dogs, this peculiar little “glitch” in the brain’s memory processing system can have devastating consequences. (Excerpt from:The Dark Side of Socialization: Fear Periods and Single Event Learning – Dr. Jen's Dog Blog
I commend you for understanding about your dog's PTS event, and for getting a new bowl and changing location of bowl. A great start!!
Anyway, what I would do in this case where your dog is feeling uncertain/anxious about eating from the bowl is to make the bowl a super awesome fun times treat dispenser!!
Many times a day go and drop amazing small food bites in the bowl. Call your doggie over and say "treat" in a super happy fun voice, or whatever word/phrase you like. Use highest value food bites like cooked chicken or meat, cheese, hot dogs, stinky wet canned dog food, hard boiled or scrambled eggs, warm homemade chicken soup, etc. Whatever your doggie LOVES. Use many SMALL bites, not big ones. The idea is zillions of repetitions so your dog re-learns that a dog bowl brings happy times, not trauma.
If you worry about your dog gaining weight, we just short my dogs breakfast or dinner according to how much food or treats they have eaten during the day, as we train throughout the day for various life lessons and manners.