Hello.Most of
diarrhea without signs of alarm (apparently you have not) the cause is a virus and therefore does not require antibiotic drug (indicated for bacterial diarrhea).Usually a dietary treatment is prescribed: rehydrating isotonic drinks and
astringent diet: rice, chicken, banana, apple, carrot ....sometimes even some antidiarrheal drug for example loperamida.
Majority of diarrhea are resolved 72 hours after start that treatment.
If diarrhea is not resolved in 72 hours or is suspected bacterial diarrhea, a sample of deposition is taken for analysis and is prescribed an antibiotic.
This antibiotic should be taken for about 7 days and only can be changed in function of the analysis results.You have taken 3 different antibiotics in 3 days.Your diarrhea has not improved and ,probably ,intestinal flora has been destroyed.
I think that now you should combine the isotonic drink with astringent diet referred.You must too go to your doctor for prescription of regenerating intestinal flora (
Saccharomyces boulardii for example) and ,perhaps, antidiarrheal(
loperamide or similar). Until you go to your doctor,is not recommended antibiotic drug.