Hi,
Welcome to health care magic,
If there is abdominal cramps with watery bowel motions then there will be chances of electrolyte deficits in the blood with gastric upset.
So,this might be related to acute
gastroenteritis or
acute gastritis.
Your husband should be monitored for vitals signs like pulse,blood pressure etc.
He can take plenty of water with lemon juice (added salt),coconut water or WHO oral rehydration solution especially if there is nausea and vomiting also till your doctor's appointment and will feel better with this.
The important thing is to combat cramps and for which he would also require antiemetic drugs (mostly oral) with antibiotics (
norfloxacin with antiprotozoals like
ornidazole preferred) with other water and electrolyte fluids.
It is good that he gas recovered well from
prostate cancer and his PSA is within acceptable range.
So,it would be advisable that he should go to physician for further help and for all routine blood investigations and proper treatment.
Thanks and Regards,