Is it possible to have both schizoaffective disorder and adhd?

Yes: You can have schizoaffective disorder and diabetes, schizoaffective disorder and ptsd, schizoaffective disorder and adhd. You can also take medications for both conditions. With your particular combination, i would encourage you to do regular aerobic exercise, get adequate sleep, do mindfulness meditation, and eft (emotional freedom technique / tapping) -- to get mind & body better regulated.

Yes: Not uncommon in ADHD to be comorbidly diagnosed with other conditions. It happens in 50% of the cases.