Okay, I remember reading about that now.
I would see about finding another vet, are their any others in your area who have chins who might recommend a vet? Amanda is in Bowling Green area I believe, is that close? She might know of someone.
Reglan and propulsid need to go together usually, although it depends on where the blockage is, one works the upper, the other works the lower.
If this was my chin this is what I would do ( disclaimer - I am not a vet, what works for me might not work for you, etc, etc. )
I would not be on an anti-biotic unless there is an infection or a reason for it, it's just adding more stress to the body.
Probotic every 4 hours ( acidophilus is good you can't OD on it) , simethicone ( baby drops ) one full dropper every four hours, and hand feeding every 2 hours when possible to get at least 60 grams total of food in per day. Free feed hay and pellets, and weigh daily. Be sure to weigh at the same time daily as weight fluctuates throughout the day. Offer one or two plain shredded wheats if they will take it, anything in (other than high sugar) is good and will help whet the appetite.
If you are not noticing any drinking you can try to sweeten it with some non-sweetened apple juice to help induce drinking. Massage the belly before hand feeding by gently rubbing in a circular motion moving up and down the abdomen. At first chins may be uncomfortable with this, but they quickly learn to like it. Due to the previous/initial injury I would try to keep him in his cage, where as normally I would suggest free play to get the gut moving.
I would give half doses of metacam, in my personally experience I don't use a lot of metacam because I truly think that chins need to feel some of the pain to help them from over doing it and causing more damage. I treat myself the same way.
Bloat does not cause the feeling of a mass in the belly. I am assuming he/she felt this by palpating. There are two types of bloat, hard bloat and soft bloat. With hard bloat the entire belly feels firm and full, with soft it feels soft and squishy.
As Tunes said no Pen. if your vet wants to do an antibiotic ( question him on why he is, it is only good to fight bacterial infections and most have the side affect of decreasing appetite ) to do a TMZ or sulfa based.
When hand feeding an adult be sure to make the mix thin enough it squirts out of the syringe fairly easily. Be sure to get the tip of the syringe past the check pouches, sometimes you may need to encourage swallowing by tipping their head up, gently blowing in the nose, or gently rubbing the throat in a downward motion. Generally after a couple days of getting food in they will get their appetite back and be more helpful for you!