Sudafed (the real “behind the counter” stuff) as well as all the D options that contain it, are stimulants. There’s a reason they’re behind the counter and you have to give your driver’s license - they’re a precursor in the manufacture of methamphetamine. It’s certainly not meth, but it does act as a stimulant.

All stimulants can have interactions with all kinds of psych meds. If you’re having issues, discuss them with both your psychiatrist and your GP. You can also talk to the pharmacist, who might have some options for you.