I need to quit coffee!!

I quit 2 years ago and I felt so many benefits. I really need help to stop using coffee as my "comfort food". I have PTSD and lately I find myself going straight to coffee which is only comforting for a few minutes, but the aftermath is that I do not have control over my emotions and I say things that I normally would not say. I feel like I have lost all self control and discipline. Has anyone experienced this? Do you have anything constructive on how I can get on the path to decaf? Thank you!!