As an outsider, its not always easy to determine what DoDMERB may consider major or not, disqualifying or not. They are looking at things as to how they may affect a future cadet/officer/etc. and the ability for that person to be deployed in all areas of the world. When my son went through it, we were sure that he would be DQ'd for major surgery he had as a newborn. They did ask for documentation of the surgery and followup care, but then was cleared no problem for that. What did almost derail his dream was a simple fall that caused a mild dislocation (with no lingering problems affecting his ability to continue with sports etc). He initially was DQ'd by DoDMERB but ended up getting a waiver from the SA after additional testing, x rays, etc. showed he could handle the rigors of basic and beyond. But the whole process took 4 months from initial DoDMERB exam to receiving the waiver.
So for advice to anyone now going through this process, take the DoDMERB exams as soon as they are made available to you. Especially since it seems to be that this year there is a possibility that the process won't begin until the applicant is deemed a qualified candidate (has a nomination). But while you wait, if there are any things in your medical history that you think could be an issue (broken bones, dislocations, asthma issues, some allergies, etc.) start requesting medical records from the doctors, hospitals, etc. that were involved. At least you'll have it at hand if it is requested by DoDMERB and can quickly send things in.