I don't know your particular circumstances but I've been there in a way that had me convinced I was ruined for life. Recovery has been measured in terms of years, but everything I thought was permanently damaged and lost came back. My own addiction history involved a lot of drugs that wreaked havoc with my neurochemistry, and it took a long time for me to grasp the patience to realize this was a journey of years back to mental health instead of days, weeks or months. I'm probably 4 years from my last drug bender and am still improving. I've reached a point where I feel as sharp as I ever have and have regained my mental spark. It's easy to fall into a trap of believing you are permanently damaged and focusing on it so much that you spend all your time finding proof with everything that happens becoming another self-reinforcing validation of how messed up you are.
Give yourself time. Wishing you all the best.