bleeding nodules in small intestines

My husband is in remission from Lymphoma, he has a bone marrow transplant last Jan. now he has black tarry stools, it has been determined he has bleeding nodules in his small intestines,  The whipple surgery is out because he is so weak. He is losing a unit of blood everyday.  Is there any other procedure or supplement he can take?

[boron]

Black tarry stool would mean a bleeding from a stomach or above and not from intestine (which would be red). I don't want to make a mess here, diagnosis of nodules in intestine can be just correct, but there may be additional source of bleeding. Blood gets black from gastric acid.

But black color can come from iron pills, or pepto-bismol or some other drug, check the description of what he is taking.

With so much bleeding, he will probably develop an anemia - how to treat that, the doctor will say. But it's important to find this (maybe new) source of bleeding. Be sure to mention this " black - tarry" and insist to solve this, I just can say it is characteristic for stomach or esophagus bleeding.