I believe this is very common to be honest. Issues with serotonin can cause anxiety, depression and ADHD, so it's common to have multiple.
I have all three and I'm on Elvanse. When I first started it sent my anxiety through the roof, but my clinician wanted me to stick with it for a few weeks to wait for me to level out, and we increased dosage a few times.
When I found a dose that worked for me, it's a bit of a trade-off. I am a bit jittery for the first hour or two of the day, but that's "jittery" anxiety rather "doom" anxiety. The sort of fidgeting in your chair kind of feeling but the rest of the day is fine. I find the trade off is worth it for me.
When i tried methylphenidate, it gave me the "sense of impending doom" sort of anxiety. That deep feeling in your chest that something terrible is imminent, I didn't like it at all and that's part of why I started antidepressants in the first place.
Two things that all types of ADD have in common are impaired emotional regulation and impulse control.
A combination with Anxiety/Depression meds and therapy might help. Some types only need an offlabel antidepressant like Bupropion for both impairments. All the best.
This is also hard because effective treatment of the ADHD with medication may negatively affect the anxiety or worsen it.
Stimulants especially in some people can increase anxiety and so on. And the worst would probably be sleeplessness as a aide effect of the stimulants that would affect the anxiety.
My son has anxiety. That's no fun. I'm glad I don't have that.
I'm sure a psychologist could load me down with some list of diagnoses if I was particularly curious. I haven't been curious, and I'm rather skeptical about the current state of psychology.
