Is it possible to develop ADHD as an adult if you've never had it as a child?

I remember being very calm and a good listener when I was younger. In my mid twenties after post traumatic events in my life, I became very hyper, unable to make decisions that were easy for me before.... I talk very fast and interrupt others. How can someone's personality alter to that extent without wanting to. It's like I've lost self control. I am very self aware so it confuses the heck out of me, but there's little I could do to change my new horrible habits. I've also become OCD where I never cared about before. Is it a mental disorder or ADD