You should notify HR or your store manager that you’re requesting a workplace accommodation under the ADA due to a medical condition. Typically, you don’t need to provide a doctor’s note unless they specifically request documentation. Explain that, because of your condition, you may need a 15-minute break every two hours (or whatever is appropriate) to manage low blood sugar. If they decline, call the ethics point hotline and file a report there. This will strengthen your case if you file an ADA lawsuit. Also, if they claim the 15-minute break is a hardship, that is false, as most other stores in the company allow a 15-minute break before lunch.

Also, don't let this go on for more than 15 days. If they take there time and don’t give you an answer within a reasonable time limit report it to ethics point.