M.M.
I have had a lot of luck with a doctor here in town (Louisville) who deals with the unusual. Her name is Peggy Fishman.: ###-###-####. She thinks of things and tests that traditionally trained docs overlook, and she looks a nutritional deficiencies. She has helped my kids and my sister's kids immeasurably. Also, I used a baby probiotic when my child was your age. Both my children still get one, they chew them now. My babies were colicky. Probiotics help aid in digestion and really help with gas discomfort. I get them at Rainbow Blossom or Whole foods. The assistants who work there will give you an education on nutrition and wellness.
Good luck,