Look for and ERISA lawyer oif you are looking for LTD benefits.
My lawyer worls with both LTD and socail security. His name is Mark D. DeBofsky. He is at Daley, DeBofsky and Bryant in Chicago. He was my attorney for LTD benefits (since I got turned down the first time). I applied for SSDI benefits separately (though he does SSDI as well). He was able to point me in the right direction to have tests done that would prove my case. Even six years later, when I was being reviewed for LTD, he pointed me in the right direction fot some tests that would prove my disability even though he didn't have any money on the line.
It's a hefty price because they work on contingency. Also the tests like PET scans and Neuropsych exams are also expensive. But if I could give one piece of advice, I would say spend what you can on the documentation of your illness. Maybe it might seem like a lot to get those tests now, but if you get SSDI or LTD benefits because of it, it becomes so much easier to live whith this disease.
I felt like upon his advice I made an investment in medical diagnostics so that I could receive the benefits that I deserved. We all know it is not easy. But I couldn't imagine what life would have been without the LTD benefits.
I would recommend him. http://www.ddbchicago.com/main.htm
I hope that helps.
I have no financial interest in this company.