Rear end accident, a passenger and hit by a drunk driver is a slam dunk, and you wasted your time on a lawyer, since under no circumstances would this accident be disputed and paid.
A passenger never has fault, even if the driver had been at fault.
You have, my guess, whiplash which is common in rear end accidents. My guess that the treatment you received was from a chiropractor?
Most injury settlements include
-reimbursement for medical bills
-lost wages, if documented
But, when they settle, then any settlement you get will be reduced at least 33% to this lawyer you hired.
Don't believe all the TV ads and the billboards. You hire a lawyer when they dispute fault and/or your injuries. You did not hit the lottery and they will pay what they believe your settlement is worth, (minus) your lawyers fees.