What can i do??? i hired a lawyer on my roll over accident and he lied to me about how much pain and suffering i was entitled to

i was in a severe roll over accident back in may of 2010. a passenger in a truck with a drunk driver who flipped the car. i was pinned and the accident resulted in me having to have 3 spinal surgeries, a close head injury and my back is still just crumbling. i hired a attorney. he not only advised me to settle on my pain and suffering before we even settled the pip but he had me settle it out before my second surgery was even over [ mind you i had 3 ] plus he told me that i wasnt entitled to anymore money then 20,000 and not to even bother to try to go for more because i wouldnt get it. we have since settled the pip and i am waiting on that check [ which he is holding that to ] but after looking some things up on the internet and seeing some laws, i think he lied to me just to make a quick buck and took advantage of me while i was hurt. i want to know if theres anything i can do about him deceiving me like this. i trusted him at one of the lowest points in my life