I would recommend trying again but discussing it with an attorney. Most attorneys work on a contingency basis and there is a cap on how much they can be paid in a disability claim (max is around $5000). Most work on a percentage basis as well so even if their percentage would equal more than $5000 they could only accept up to the $5000. An attorney can be very helpful with all the paperwork and helping prepare you for court, dealing with the appeals process, etc...
Good luck. I do hope you have much better luck than I have had.