Thanks for writing your query.
Smelly gas with nausea
and stinky stool are common in infection of the gastrointestinal tract.
You should get yourself investigated for :-
2. Stool Examination
You can start antacid
, antiemetic like Domperidone
and if needed (according to reports), antiamoebic and antibiotic. You should get yourself examined and investigated by your doctor and take medicines only under medical supervision.
I hope this is helpful to you.