Brief Answer:
more testing needed
Detailed Answer:
hello,
i will try to help you. i am a gastroenterologist.
Fist of all C.Diff can recur after treatment so obviously that would be the first thing to rule out, and stool should be tested not only for the c.diff toxin (most common and cheap test), but also the c.diff PCR (better test, more expensive).
For a doctor to tell you she has Hirshsprung's disease something must have been abnormal on that barium enema, however this is a disease people is born with. She would have a history of longstanding
constipation or difficulty going to the bathroom to defecate.
Any
viral gastroenteritis can produce loose stools, bloating, gas, etc. These symptoms usually last <1-2 weeks, however after any infection you can remain with what we call post infectious IBS (
irritable bowel syndrome).
I would recommend checking the stool for all infectious agents possible. She can take some probiotics and
simethicone (over the counter) in the meantime for her gas, loose stools.
Celiac sprue is always in the back of our mind with these symptoms, and this can be checked with a simple blood test. Thyroid studies evaluation is also recommended (blood test), as
hyperthyroidism can cause chronic gastrointestinal symptoms.
If still no answer with above, and she continues with symptoms, then she should get an endoscopy and
colonoscopy with biopsies.
hope that helped.