Hi.
Thanks for your query and an elucidate history.
First of all, remember 2 cm functional cyst does not need removal at all, most of the times it gets absorbed on its own.
The additional symptoms of pain in a abdomen along with diarrhea, nausea,
frequent urination all suggest that you may be suffering from a severe for m
gastroenteritis and may be an associated
Urinary tract infection.
I would advise you the following:
First of all send the samples for tests before starting any antibiotic so that we can have the best results and reports to help for the most proper treatment.
Send urine for culture and sensitivity and routine tests of urine , blood and stool.
Get started on a course of an appropriate antibiotic and
metronidazole,
probiotic.
Take plenty of oral fluids,
Change over to another antibiotic as per the reports.
I hope this strategy should get you the cure.