You're young. The brain and body are resilient. I felt much like you several months into sobriety, but it got better. And I drank and drugged for forty years.
Two suggestions:
Next time you see a doctor or counselor, be honest about your concerns and reasons for them. It will help them help you.
Check out Rick Hanson's "Hardwiring Happiness." It's about changing your neural structure through positive thinking. Anxiety is like being in fight or flight mode. It's like feeling like a rabbit being chased by a cheetah. Only in your case the cheetah isn't there.
It's not too late.
You say you paid with your life. I disagree.
You'll be okay. Believe it. Live it. Make it happen.