My dad had a recurrence and then a rapid decline several weeks after that. They did an extra through MRI and found that the tumor had not grown past the first recurrence so they concluded it was a combination of the meds, that the tumor was in an eloquent area of the brain and general underlying conditions.
We attempted home care on our own and then with a nurse but finally had to go to a hospice. We were upset about having to do that until last Wednesday. Massive blood clot that required morphine and a seizure that lasted about 7 hours made us thank for there was a doctor and nurses there to deal with it.
Having said that, before we made the step we tried every thing. Changed amounts, changed the medications, etc to rule that out. The reason was last April and without much reason, his entire right side was paralyzed. Increased the steroids and not full function until the recurrence in August.
Good luck.