Well, I'm quite the more disturbed type of caregiver, even moreso because I have been diagnosed with high-functioning autism since 2.
And sometimes, my elder demands so much from me that I can't help but SCREAM. I usually scream on a pillow, but if that's not enough, I'd go outside and let it all out. My relative doesn't like it (she considers it "giving her an attitude," and I acknowledge and appreciate that), so I do either or both when she's away.
But I said to myself that there are other ways to redirect my frustrations. Regualr physical exercise, Oxycise!, EFT, and meditations (just to name but four) have worked for me.
Recently, I came across people's horror stories of playing the recorder in elementary school. They were calling it names like "the devil's whistle" and "Satan's flute." They mostly think of the repertoire consisting only of children's songs and "Hot Cross Buns."
Through my fandom of Baroque music (which is a type of classical music with a lot of piece written for what most people see as a lowly instrument) and good childhood memories playing it, I'm considering taking up the recorder. It really clicked in my head as I swung between giving my elder meds and reading on people's opinions on it.
Is it another thing that can alleviate caregiver stress/anger? Is it worth my money (even when quality descant recorders cost under $10)?
This activity would be healthy for you and indirectly your family if your intellectual needs get met.
Since you have fond memories of your childhood recorder experiences, I say go for it!
I, too, am curious how much responsibility you have for Grandmother's care. I hope you have lots of support!