Hey look, the TSA has actually done something useful for travelers with disabilities and chronic illnesses. (Illness is specifically mentioned in the press release, even.) They’ve created a phone helpline called TSA Cares.
But meanwhile, here’s the number, which is toll-free in the United States: 1-855-787-2227
To get the serious help, you need to make the call at least 3 days before you plan to show up at the airport. If you do that, they’ll go so far as to make sure they’ve got specially trained agents present at security when you arrive to help you through screening.
In theory, the operators answering the TSA Cares line are specially trained to answer questions and provide service for travelers with disabilities. I haven’t called them, so I can’t speak personally to the expertise of any of the operators. If you have the opportunity to chat with these folks, please comment here and let us know how your experience went?