Almost sounds like a Herx reaction? Maybe your dose is too high?
"What are the symptoms of die off bacteria in the gut?
Pathogen & Parasite Die-Off Symptoms: How to manage detox ...
Die-off symptom: Increased GI upset

With all the action happening in the gut, it is no surprise that increased GI upset is common during die-off. Diarrhea or constipation, bloating, gas and abdominal pain are often reported as pathogens die and excrete toxins into the gut."