You are entirely within your rights to state the facts and ask the panel not pose questions about the situation as you find it painful to talk about it.
To help the panel stay off the subject, make sure that what you say about the mitigating circumstances is clear, completely credible, not exaggerated, and that you state exactly how it affected your child for both tests. If you have any supporting evidence, draw it to the panel's attention at this point. That should be all that they will need to take it in to account.
Guest1, the panel will not want you to say more than you wish, but it helps your case if they really understand your extenuating circumstances and how they impacted on your child.
Rest assured that panels are usually very considerate.