Hello, Looking For Some Info Regarding My Mom, 81 Yrs

Hello, looking for some info regarding my mom, 81 yrs old....just had 2 episodes with some a-fib where she was taken 2 the hospital...she's taking donepezil...for some early dementia symptoms...& looking at other dementia meds...where heart issues seem to appear...thinking of asking her gp dr. to maybe taken of off that medication...try B12, possibly...some help with a bit of depression...that's why I'm researching B12, etc..my email...is YYYY@YYYY