BMW 03 530i shaking

Yesterday I had my car in park, just sitting in it, and
it started shaking. So my first reaction was to turn it
off immediately. I turned it back on and it seemed
fine until 30 seconds later, then it continued to
shake. So i hurried home to try and avoid a break
down. My mom needed to borrow my car this
morning, and i told her the problem im having with
my car but she still drove it. Then she tells me when
she gets back, my car is shaking very violently and
now its like its getting no power. She had tried to
make it up a hill and she was afraid she wasnt going
to make it, she even had her foot all the way down
on the pedal.. i dont want to take it somewhere yet
for someone to test it.. ive put so much into this car
and i dont want to get f*ucked over again.