That sounds a lot like what is happening to my 48 year old Dad. He was recently diagnosed with melanoma that spread to his brain (They still haven't found the mole it came from). He had a crainiotomy to remove a lima bean sized tumor and he did relatively well after the surgery. But the cancer is also in his mininges, which has caused mengitis like symptoms since 11/07.
He started whole head radiation last week and is on Temodar. Each day his dimentia and hallucinations seem to be getting worse. He keeps insisitng he needs to clean the basement or fix the windows. He even tries to get up to go out into the garage to fix something. He hears hissing sounds and sees water from the ceiling that is leaking onto him and making the bed all wet. I hope they don't have to discontinue treatments.
He also starting taking medication for a thrush diagnosis this week. I think it is reacting to the steroids (I read that it could interact with them and keep the steriods from being absorbed by the liver).
This is so scary and it moves so fast. My dad lost one of his sister's at 48 due to brain cancer (we don't know what kind). And another one of his sister's had meloma that spread from a mole on her back to her breast. She has been cancer free for about a year now.
I can't stand to see him like that. It is like he is a different person. Is this something that will pass?
My thoughts are with you and your husband.