Is this normal at this point in pregnancy?

I have been nauseous all day long. I was able to take a couple bites of my breakfast this morning but every bite I took just made me more and more nauseated. I also was overly exhausted like I haven't slept in days. It was so bad to the point I could no longer keep my eyes open without getting a headache. So I took a nap and then woke up and had diarrhea. Now I'm still laying in bed (haven't eaten anything since this morning) still nauseous, getting acid reflux, and a bit tired with a mild headache. I'll be 34 weeks Sunday. Anyone else experience this at this point in pregnancy or should I call my doctor?? It's just really strange because yesterday I was perfectly fine.