I am on SSD, however, my gastroenterologist is the dr that insisted that I file because of my crohns disease. I filed for it and was awarded benefits immediately. I did not use an atty because I worked as a paralegal for 20 plus years and knew about filing for SSD. One thing I will tell you up front is you must have your drs behind you 500%. In fact you will need for your dr to state you are unable to work in order to have a date disability began. Without a dr saying you are totally disabled you won't have much of a chance.
I also obtained all of my medical records and provided legible copies to SS. Do not rely on your drs office to send in copies of your records. For some reason medical records copying is the least liked job at a drs office and they tend to back burner request for medical records. A request for medical records from SS was found just laying in my chart in one of my drs offices, no one had bothered to send the records. This is why I say do this yourself. Many times Unfavorable Decisions are by by SS and its because they do not have all the medical records.
I had a case worker assigned to my claim. I kept this person informed of every appt and what happened and if medication was given and when my next appt was scheduled. This person appreciate my cooperation and she kept my file updated too.
I do know alot of time your age and education can play a role on the decision too. Some will disagree with this but I have seen it happen over and over. I have also heard its harder to get in some states over others.
Be sure to keep a copy of everything you send to SS. You need to keep a copy of all the forms you have to fill out and send to them. You will need at some point to reference back to these forms to see how you answered something. Alot of their paperwork is duplicate but you still have to sign and fill it all out and send it back.
Good luck and I hope you get your benefits. Susie