Could i be diagnosed wrong?

Kristina • I'm 23 years old, Currently single and not TTC. I joined Eve to help track my period and talk in the groups😀
Hi ladies. As of right now i am diagnosed with:
        - generalized anxiety disorder
        - pervasive devlopmental disorder NOS  
        - some ADHD like symptoms 
Ive been on medications for these issues since i was 6 ( btw, Im 20) and for as long as i can remember ive felt this overwhelming sense of stress, that never seems to go away 😣
I have been in counseling since I was 12 years old, seen many many professionals who've tried several prescriptions with me..
This makes me wonder if i could've been diagnosed wrong, like if theres some underlying health condition that is causing these symptoms.
What do you girls think? Any input would be great!