Tremors in hands. How will i manage.

My mother is 50 years old. She has been on medication for sleeping disorder and depression after i was born (around 32 years now). She was fine all these years with medication for sleep in the night. from last few years her condition has worsen and her psychiatrist says she is schezophrenic. From last one year she has shaky hands. She spills food while eating, she brings a cup of tea half of it is fallen. we did ask the pyschiatrist if its the side effect of medicenes for which he said No. She is unable to walk for even 500 meters, she walks for 5 mins and her legs pain badly. she feels she is week. I have also noticed that she remembers everything from past well but sometimes forget what happened recently. she is not very alert. even if we talk to her i feel she is unable to concentrate on what we are saying. constantly thinking about something. She is too stressed for smallest things- what will i cook for next meal, do i have sufficient vessels, maid doesn't come, how will i manage.