I'm not a doctor or anything but I do a lot of online, book, and self research. My younger and older sisters have had messed up stomach/digestive problems for most of their lives. My older sister has it pretty bad, she gets foamy burps (which sound absolutely disgusting), foamy diarrhea, and she'll vomit up anything she tries to eat IF she doesn't eat some FERMENTED food everyday. She eats only organic food and YET this still occurs unless she has something properly fermented in her diet that day.
Fermented foods like, fermented cabbage (sauerkraut, kimchee(Make Sure There's No MSG! Also make sure It's TRULY fermented), RAW honey diluted in water sealed and fermented for at least a few days, kumbucha tea, the list goes on. I urge you to research fermented foods and foods that are probiotic, don't stop at yogurt, dig further. These foods will literally start aiding and healing your digestive tract. Things that can mess up the flora in your tract are many antibiotics, toxic foods (fast food and very processed foods), pesticides, etc. I also would like to suggest looking into Grapefruit Seed Extract (GSE). Also Turmeric, used for thousands of years to treat depression, inflammation, pain, etc. If you have digestive problems please please avoid MSG (Mono Sodium Glutamate), ALWAYS look at the ingredients! MSG WILL fuck up your intestines and most ALL Fast Food restaurants have MSG in their 'food'.
I sincerely hope you feel better and I hope that I have been of some help.
Best of healing to you <3
Aloha~