Alot of disability firms will want you to have been denied at least once.They are only allowed to take up to 25% of backpay and are often awarded less due to time spent in the system and amount of work they claim they have spent on your case.
If you are 19 and do not have enough work credits to qualify for SSDI you should go to SSA.gov and read up on filing for SSI.There is a filing for individuals who become disabled before the age of 22 and the disability has to be judged to last at least a year-its a lot like SSDI but doesnt require work credits.
The best thing you can do is to make SURE all of your dr records get to the lawyer and to the SSA.If you are filing there is a cap on what they can charge for copies.Make sure those records are as concise and complete as you can.You would be surprised at how many "dont get there or were never received"
Be proactive and dont assume that the lawyer will necessarily work for their money-make sure they do.
If you were diagnosed 3yrs ago,have had continuation of care(seen a dr regularly)and have medical evidence to back it up it will put more weight in your corner-the more paperwork the better.The system is designed to get people to give up.
I applied in 2008-got denied within 3 months-refiled got denied again in 2 more months and requested a hearing before an administrative law judge.It took me a year to get there and three months after my hearing to get the award letter of fully approved.
So it took from 7/08-4/10 to go thru the whole process.Some states are quicker than others but a denial the first time is the norm.Dont give up,try contacting lawyers in your area see if they have a mandate about taking on disability clients because like I said some want at least one denial,some want 2 and some dont care and will take you from the initial filing on.THen call the SSA 800# back and ask about filing for SSI since due to your age you do not meet the minimum work requirements.That should have been done from the get go....sounds like you got a really lazy worker.
Here is a really helpful website that has tons of info about the process and a message board for people going thru it currently,those that are in the denial/appeal process,those that have been awarded-and examples of letter sent by the SSA detailing what additional info they look for,and the hoops they make you go thru . www.ssdfacts.com It was started by a lady when she began the process and contains a wealth of info and examples.Hope it helps.
Good luck-dont give up.