I think my dog ate an edible

I feel terrible, I'm not 100% sure since I never saw him do it and I'm not sure where he would have found it, but I think my dog ate an edible. I have no idea how big and I'm hoping it was just the one, he's a pomsky about 30 pounds. If the edible was full sized (I usually cut them into smaller pieces) it would have been about 420 mg. He's acting a bit disoriented, he's not seeming willing to walk around, and his breathing occasionally gets quick. He's not drooling and he puked about half an hour ago, I couldn't tell if there was anything in the puke. Does he need the vet? I would have to call my boyfriend home to drive us, I'm just really scared he's in danger right now