Getting my accent sorted.?

Well, right now my primary lang is English I doubt that I will stop speaking my native language, but my accent changes or even worsens, sometimes I cannot pronounce some words and it bothers me. Could it be due to stress or shock that my speach patterns change, could I even start stuttering? I need tips on how to do it myself, self help books or whatever. I think I even have an accent in my native language as well. And for those who in chakras, maybe it's the point where i need to develope it more, I know a few visual exer. Anything interesing I could read. Thanks!