Asking for help( caring for a loved oned showing signs of dementia)

Hello everyone,
Me & my mom would like some advice. We are currently caring for my grandma & she has been showing signs of dementia. We have been to multiple doctor appointments, just waiting to hear the results. Even though she hasn’t been diagnosed, we’re pretty sure it’s dementia being that in runs on her side of her family as well.
She shows a lot of different behaviors such as re arranging things, throwing objects, and acting angry at times. Sometimes it’s nothing we can do to calm her down besides walk away.She also talks about the past a lot including her deceased husband. She takes medication to help her sleep because without it she will not sleep. Even when she takes her medication, there are nights where she won’t sleep as if she’s fighting to stay woke. Normally when she doesn’t sleep, she is very mean to us.I am asking for some advice & suggestions on how you’ll have/ are taking care of a loved one?
Thank you in advance for responses! :( :(