Barbara,
I was not able to post for a while.
Sorry to hear about the decreasing blood counts.
What are the numbers?
Did your husband ever have his blood Vit D checked?
It is best in the mid reference range 30 – 100 ng/ml
There are a lot of new information about Vit D and Cancer prevention the last ten or so years.
http://forums.marrowforums.org/showthread.php?p=52417#post52417
Please also check the blood copper/zinc.
I had severe diarrhea in July 2017(MDS dx Sep 2017). The stomach upset probably made copper deficiency worse and affected my MDS downward.
I happened to eat more copper rich food while taking Vidaza. I suspect I was copper deficiency, and its possible both more copper and Vidaza helped me.
It will not hurt to check this out.