Be aware that if you become diagnosed when you do not have insurance may make you disqualified for insurance in the future as a "pre-existing condition". I realize that the new health care law may change this but I will only believe it when I see it.

With respect to SSDI, remember that you have to have a work history (I think it is 10 years) to qualify and additionally they look hard at medical records. Since you have not even been diagnosed, the medical evidence may not be sufficient at this time.