I'm Dr Chaithanya attending you
This seems to be GI infection
What I suggest is to have Probiotics with combination of Lactobacillus and Bifidobacterium for 10 days
Take Metamucil, a fibre supplement that can help in relieving constipation
Continue prune juice once a day for a week
You should be normal with these.
If the symptoms continue, you need to go to the doctor for antibiotics
For abdominal pain use Hyoscine butylbromide tablet available in Pharmacy
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