I know someone (but not with diabetes) got help from Nolo.
Here is info. I believe they may offer initial evaluation at no cost, but to proceed after denials may cost more for their time and prep work.
Are you currently working?
What about your medical conditions makes it difficult to work or find suitable employment? Nolo can help answer this and help determine chance of being approved.
You may find other places similar to Nolo that can help.