Hello, thanks for the query.
The side effects of Amoxycillines are diarrhea
, since you have diarrhea after the use of Amoxy .
2nd point is that accrding to you your's sinus infection
had cured , so no need of any Amoxy.
When you will stop Amoxy with 2-3 days your's diarrhea will stop.
Until this you have to use lukewarm water with rice , curd, and few hard type bananas.
With above mentioned diet you will get relief from all your problems.
Good luck . Dr. HET