I am so sorry you are going through this.
I am assuming you went to the Mayo Clinic since you are on this blog. I also went there after a brain tumor diagnosed. They were wonderful. Do you follow up with brain scans to see the status of your tumor?
I had Gamma knife and surgery in 2019. I also have increased
mobility issues on my left side which effects my hand and walking. I have started seeing a motion specialist (who knew there was such a thing) in my city who has helped me with medication and physical and occupational therapy . Please know that you are in my prayers.
God will take of you.