AUDHD people how did you know to ask for autism tests also?

I got diagnosed for adhd a year ago. Got the meds but I still struggled to the point of burnout. I have been on sick leave for 7 months now.

Weeks go by so fast when you are exhausted from the second you wake up. Sitting on the couch feels exhausting that I have to go lay down in bed.

I felt like getting diagnosed was the last drop that drove me to burnout. Also when I complained to the doc that my vyvanse only worked for less than an hour we upped the dose so that also drove me deeper to the deep end trying to get through the days.

I’m wondering if I’m also autistic or can just adhd be so hard?