You look likely to be interested in these web sites:
http://www.freemedicalcamps.com/
http://www.ssa.gov/disability/
http://www.needymeds.org/
http://nfdh.org/joomla_nfdh/content/view/24/47/
A collection of advice for a group of diabetics who have been more successful than usual with controlling their blood glucose readings:
http://alt-support-diabetes.org/new.php
If your disability allows, I've seen these two web sites recommended for finding jobs where you can work through your computer at home:
http://www.flexjobs.com/
http://homejobstop.com/
Have you found the category Disabled yet, for some other discussions?
If you're interested in volunteering for free medical care, but by medical students and with no help for transportation expenses, medical schools often offer this, so you could check if any are within reach.
If you're interested in volunteering for clinical trials of any new medical treatments, usually free but with no help for transportation costs, see here:
http://clinicaltrials.gov/
