Mel if you really feel that unwell get checked out.
I was 34wks pregnant with DD2 & i had similar symptoms, i put it down to pre labour but because K wasn't moving i went to hossy to get checked out.
Long story short i had a bug & ended up severely dehydrated & almost need an emergency c-section as her heart rate was up at 220 & wouldn't below 200 for hours.
In the end it took a whole day to get her back to normal.

I'm not saying this will happen to you as i was really sick towards the end, but if you feel something isn't right then go get checked out.
You'll feel so much better knowing everything is ok