There are reasons the standards for military medical accession are so so high, for both officer and enlisted.
One, military service is often performed in harsh operating conditions far from advanced medical care, and the military doesn’t want to further jeopardize your brain health if you have a history of concussions.
Two, the safety of the unit in an operational environment depends on everyone being in the best possible shape and as little vulnerable as possible to health conditions or prior medical issues. If you are the leader, you are responsible and accountable for the welfare of your people. You must hold yourself to a high standard of integrity and adherence to established guidelines for the safety of your team. Three, if you lie on your DoDMERB medical history, you will have to remember to tell the same lie of commission every time you update it. If it is discovered that you were not honest, the longer you waited, the worse it will be, as an indicator of your character. You have already omitted reporting the real #3, and now you are thinking about doing the same for #4. It will be seen as you putting your wants above the needs of the people you might one day lead, integrity be damned.
The link below is the current accession standard. You clearly have figured out three is a magic number for a potential DQ. If you are honest and report all 4, my unofficial opinion would be you would get a DQ. Then you focus on the waiver process and hope for the best.
No one here is going to say, “Sure, don’t report this one either. Just get some rest and be more careful in
future.
Get thy brain to a doctor. If you don’t feel good, that’s your body telling you to take actions steps to address this.