Hi.
Thanks for your query.
Noted the history about your husband having loose stools 99 % of the times and he connects these to the RLS that is
restless leg syndrome. He feels that if the abdomen is OK then he can sleep well, otherwise not.
My thoughts about your husband's condition:
Since the loose motions are there most of the times, there is no absorption of many essential elements., electrolytes and so many things that cause problems all over the body including the intestines itself.
Hence I would advise you the following:
Send the sample of stool and blood for the detailed test.
Liver,
thyroid and kidney functions along with blood sugar should be done.
Colonoscopy and
CT scan of the abdomen are a must if the medical management fails.
A course of an antibiotic,
metronidazole and probiotics may change the picture for better.
Rest of the treatment as per the reports of investigations.