Hi, I Came Down With A Cold A Few Days

Hi, I came down with a cold a few days ago (felt hot, congested nose, coughing, bags under my eyes), then a day or so later I ate something that was really rich (made with lots of butter) and since then (2 days) it has been hard to eat. Most things make me feel like I'll be sick. My stomach is distended and it hurts when I lie on my side. I've had some gas and have felt like i have to poo a lot, but have only done it a little. The cold symptoms seem to be getting better, but my stomach still feels distended and it still hurts when I lie on my side. Any ideas what could be causing this?