Hi. For me, my psychiatrist wouldn't diagnose autism, as she didn't feel comfortable in it, so I had to go to a psychologist for that.
But occupational therapist are the ones who diagnose SPD. They do assessments there.
Would you feel comfortable being diagnosed with ASD?
Anyways, I can totally understand sensory overstimulation. For me, I now live in a big city and it's very easy for me to be sensory overstimulated. It's mainly sound for me, but I can't stand some smells and crowds. I wear headphones and listen to music when walking anywhere. I haven't had a meltdown since I did this. Smells I just sadly live with. I hope you find help.