It's hard to say what is normal in various diseases. You might ask his doctor or do a Google search. My husband just died of lung cancer on July 7th. He experienced symptoms that I didn't expect until I looked it up online such as hoarseness, weakness, confusion, not being able to eat much etc. Just love him and let him know that you do love him everyday. Pray together often. My husband and I told each other very often how much we loved each other and it helped. I'll say a prayer for you.
PML