hi welcome to HCM
i had gone through your query and understand your concerns. i would come up with the possibility of IBS;IRRITABLE BOWEL SYNDROME
may be the cause for your husband complaints.
i advise you taking Homeopathic
medicines gives safe and permanent cure for your husband complaints
consult your local homeopathic physician for correct diagnosis of the case and remedy to fit his complaints
I hope this is helpful for you, thank you