Hi.
Thanks for your query.
Noted the history and understood the concerns.
The white stuff is the mucus that is secreted by the large bowel in response to the irritation it has.
Since you are suffering from pain in abdomen,
diarrhea and headache for a week and must be suffering from
IBS for a long time, the present problem may be due to intestinal infection.
I would advise you the following:
Get the stool tested and blood for CBC,
thyroid and other relevant tests as may be advised.
This will tell us about the possible infection and if present can be cured by an appropriate antibiotic,
metronidazole and probiotics.
About the IBS, it has specific medications and control of the
stress or any psychological problem can cure it.