Trauma affected my grades while in undergrad, how will it affect me getting into graduate school?

I was traumatized by an abusive relationship. While in the relationship, my grades were affected. Out of the relationship, I chose to stay in school and struggle with my studies instead of medically withdrawing. I attended therapy and completed psychiatric care.

I'm back to being a straight A student, but what will graduate school say in reference to those 2 years on my transcript? Should I explain it to them? Will I be granted an interview even? My GRE scores are great, but my major is competitive. What can I do? Should I include a letter that certifies what occurred in those two years from a professional?