Unfortunately this is the way things are w/some GBM patients depending on where their tumors are located. Went through the same thing w/my husband. They can't control it and I almost felt like I could've bitten my tongue off trying not to "feed" into his rants. I would not trade being his caregiver for the world even during the worst. Just a few days before he passed, he was calmer, nicer and finally let me cry about his/our situation.
Take a deep breath and try to remember the person he used to be! It's got to be hard as a patient knowing things are beyond your control. And they must worry a lot about leaving us all behind.
Being a caregiver is one of the hardest things to be. Make sure you try and get some time to yourself.
Strength and prayers,
Debz
Wife of Jimi dx 2009 gone to God 10/29/10