Could I have given myself food poisoning?

Okay, so for dinner I had pasta with sausage (sausage was a mix of ground pork and beef). The sausage had been completely thawed in the fridge for 2-3 days (not 100% sure). But I may not have rewrapped it properly after the other times it was used.

Since dinner I've had the runs and nausea (sorry, TMI, I know). Dinner was at 5pm, and it is now midnight and it doesn't seem to be getting better. I also have a weird pain in my stomach that kinda feels hollow.

I'm hesitant to take Gravol because I've been having constipation issues lately and if the nausea is from that, it'll only make it worse. But at the same time, I don't want to not do anything if it's a problem.

Could I have given myself food poisoning?