Hello and welcome to healthcare forum kayleen.
Your lower abdominal pain
with blood and mucus containing diarrhea and vomiting is suggesting most probable diagnosis as amoebiasis colitis, which is a parasitic infestation.
Other differential diagnosises would be bacillary dysentery
and irritable bowel syndrome
. To confirm the diagnosis you will require ultra sonography of abdomen, stool routine and microscopic examination and some routine blood investigation.
After that consult a gastroenterologist
with your reports for further guidance.
Best of luck.