I could not find any definitive research about the likelihood of receiving a concussion over a lifetime. Based on the number of reported concussions each year and considering that the vast majority of concussions are not reported, it appears that getting at least one concussion in a lifetime is quite common.

I don't see where you ever told us how you received your concussion. I see a reference to a fall as a child but that is it.

How did you suffer a concussion and when ?

Regarding personality disorders, multiple concussions increase the probability of depression. But, I think many of these emotional issues result from the subject not getting the professional emotional treatment earlier. Learning how to moderate OCD thinking and anxiety makes a big difference. Anxiety slowly exhausts the brain leading to depression. Depression, in its basic form, is the brain reaching a point of exhaustion and then failing to be able to moderate itself thought-wise. This exhaustion leads to imbalances of neurotransmitters and such.