I recently have had a very damaging experience with MDMA and understand some of what you are going through and I am very sorry you had to go through this. After 3 months of little progress I decided to see a therapist for the same reasons, anxiety, depression, paranoia ect.. It has been beneficial so far. I think the main thing is having someone help you recognize some of the unrealistic negativity. I know I have been thinking negative but I was surprised to see how how that negativity distorts reality and that can be a little scary. So my experience with therapy has been beneficial but to be honest, I believe with time I would come to the same realizations and be able to recover fully on my own, a therapist just helps speed that process along significantly.
Another thing that would probably be very beneficial for you is mindfulness meditation. It's main benefits are all about getting a clearer picture of your reality, which means reducing the negativity and helping you feel more in control of your thoughts and grounded to reality. I had the same experience where I heard voices of people talking about me some, real, some not. It was very damaging to my perceptions of my self and created a ton of anxiety in social settings. Mindfulness really helped here as well.
I am drawing from my similar personal experience but I hope that this may help. I wish you luck in your recovery.