Another way to consider this is that DoDMERB is interested in your doctor's findings, not your (or your mom's) self-diagnostic or self-treatment history. If your doctor has told you that you have allergies, that is key. If you *think* you have allergies and find temporary relief from some over-the-counter meds, that is your issue, not a doctors findings.
Case in point: my DS reported allergies to cinnamon. Big flag. What was it? When he was maybe 2 yrs old, mom put cinnamon on his apple sause and his lips got redder for a bit. Ever since then she had always told him that he was allergic to cinnamon. It never happened again, but it stuck in mom's memory, so it was passed on to my DS. Never a doctor visit, never a test, never a medical diagnosis... just a mom. Fortunately, DoDMERB deals with this stuff all the time and after a written statement from mom plus providing as many medical records as the doctor had to verify that he had never even been seen for this, DoDMERB declared the issue dismissed. The concern though is that the remedial process takes a LONG time and can really delay your processing.
So -- absolutely be straight forward, yet understand they want actual medical professional documentation, not mom's personal thoughts. Hope that helps.