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?
I'm going to make this an answer rather than a comment; I hope others will react to it, especially if I'm wrong.  (I'm a teacher, not an admissions officer.)

From what I understand, you had good grades at the start of your college career.  Your grades declined for external reasons.  Your life is back under control and your grades are back up.  You have a little more than a year to gather good grades on your transcript.

Go for it.  Apply to the schools you'd like to attend, but apply to a couple of Plan B schools as well.

Here's the part that may be controversial:  You might want to include in your cover letter something like "You may notice that there was a slump in my grades during my time as an undergraduate.  That was due to a difficult personal situation, now resolved."  (Thanks, Nate Eldridge, for the fine phrase.)

The other choice would be to mention the grade slump not at all.  In any case, don't make a big deal of it.