Obviously there's a need for education here. TSA officers are supposed to be well-trained and familiar with screening requirements that may come with certain medical conditions. What's most important is that you let the screeners know what medical condition you have.
The TSA has screening procedures to make sure that everything and everyone is screened properly. For example, I have an ICD and can't go through the metal detectors, but I notify the TSA officers, and they pat me down. I also was in Barbados once and had a migraine. Mine are really horrible. When they asked me to remove my sunglasses, I almost started crying as the airport is bright. The TSA said OK before I even had my glasses all the way off. They just needed to see my eyes.
It wouldn't hurt for you to have a doctor's note verifying your medical condition and how they need to handle it. I would call the agency at 866-289-9673 and let them know what happened.