Hello - My Husband Was Diagnosed A Year Ago With

Hello - My husband was diagnosed a year ago with MW. He opt to no treatment altho the dr. did prescribe IMBRUVICA CAP 140MG. He had blood work done last week & we saw the dr. yesterday. His blood protein is a point or 2 higher & he's a little anemic. Symptoms right now include fatigue, some weakness and cold feet all the time. He is 76 yrs. old. Now after a year, he's wondering if he should take the drug that the dr. prescribed. What would you advise~?