Pot-bellied pig vomiting

Question
I have 3 pbp's- a female 6 years, and two brothers at 3 years. Recently (10 days to 2 weeks ago), the older pig has begun vomiting, and while it has happened after eating, it has also happened before meals. It seems to be a daily occurrence now.
One of the males (at least) has just begun to vomit as well- after a meal. They seem otherwise perfectly normal- good appetite, good humor, active, etc.

They eat pbp chow (1/2 cup each twice daily, plus vegetables from our garden (tomatoes, eggplant, zucchini, squash, cucumber, carrots, melon, beets) and some fruit now and then (strawberries, apples, pineapple, banana, pears). Typically they will receive 2 -3 of the veggies on the list and one of the fruits at a meal.
On average, each gets about 1-2 cups total of vegetables daily, divided in two servings.
Their diet has been relatively stable for quite some time, though they're getting a little more tomato and eggplant right now.
I don't know of anything out of the ordinary they may have eaten that could cause them to vomit, and it seems coincidental that more than one is exhibiting this behavior.
Do you have any idea what this might be? I intend to contact my vet tomorrow for his advice as well.
Thank you.

Answer
Tomatoes are very acidic, you may want to eliminate them.
It is possible that both have ulcers (pigs are very prone to them) but two having them at the same time would be unusual.
So my best guess is tha your pig chow is moldy.
You cannot see or smell the mycotoxins, often. Or they could have a virus. Or even intestinal  obstructions, never allow them to eat fruit pits!
We suggest you feed them dried baby rice cereal for a week, it is the easiest food to digest!
Good luck,
Priscilla Valentine
www.valentinesperformingpigs.com