Thanks for the query to H.C.M. Forum.
Since , diarrhea
stopped and there are cramps, nausea
All these are after effects of loose motions as many important minerals expels from loose motions.
There develops gastritis
in stomach so patient feels nausea.
The best remedy is rest and plenty of liquid in different forms, e.g. small quantity of fluid many times in day.
Lemon juice mixed with salt and sugar, juice .
Lemon juice sometimes develops gastritis so you may use some antacid
( OT C) .
Within 3-4 days sufficient to recover.
If you can't wait for that period, than get in intravenous drip of RINGER lactate & elecrolytes , after consultation with a doctor.