My son is 8 weeks old and has had mucus green diarrhea almost 2 weeks?

Hi, my son is 8 weeks old and has had diarrhea (total water with a tint) and mucusy green diarrhea for a week and four days. He has had projectile vomiting, sweats (but no fever) and his sleep and demeanor have changed. Tonight, he began wheezing/crying/screaming in his sleep.
The dr ruled out dehydration and all bacterial viruses and blood from a stool sample this past Tuesday. I have been dairy- free for a week and a half without any change in his stools.Tonight, he won’t sleep and has been crying/wheezing in his sleep.
He has GERD and takes 0.5 mg of a prescription medication for it. We also give him gripe water every four hours and gas drops with every feed. He has no known allergies. He just had a VCUG procedure done, but the results were negative.
What do i do? What could it be? All I’ve been able to find online is Pyloric Stenosis and Gastroenteritis and that terrifies me.


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