I think there is at least a year interval between disability and eligibility for a variation of medicare? I would be sure that I was signed up for Cobra coverage just in case, but follow up on other options. Cancelling Cobra is possible, adding after the fact is a whole different story.
Not knowing your situation, one possibility is to go on a spouse's program (but this is annual enrollment period, so to be considered quickly).
The "pre-existing" clauses are still used (it will be 2014 before they are eliminated), so you need the Cobra continuation to keep things in place until you find something.
I'm potentially in the same boat, and have been asking the same questions, but to a brick wall so far.
In the meantime, scrimp and save as if Cobra will be the option until proven otherwise.