If you did not experience a feeling of "Wow, I just banged my head." they are likely just sub-concussive impacts. But 10 or 20 subconcussive impacts is nothing is the scheme of sub-concussive impacts. SCI's are counted in the hundreds and thousands.

It sounds to me like you are still experiencing anxiety head aches and related symptoms. A 1-2 inch heal drop is no different than taking a step as you walk. Each foot plant likely has as much G force as that 1-2 inch heal drop.

So, stop projecting your mother's medical history onto yourself and you should do much better.