I've had food poisoning from shrimp. While it was one of the most miserable experiences of my life, I don't remember any breathing problems. I had a pounding, blinding headache so bad even the sound of my blood flowing through my veins made me sick. I had no energy to move until a spell of nausea would hit, then I would gag over the toilet even though my stomach was long empty, to the point it felt like my abdominal muscles would snap.
What you're talking about doesn't sound much like food poisoning. Calling a poison control center sounds like a good idea.