Pregnancy symptoms get in the way

I'm not usually on my feet hardly at all, but today my SO and I went out to get

the oil changed which took almost 2 hours & now were at the mall. I've been in a pretty good mood & felt decent most of the day. I was in pain last night because of my back, but I got my sleep in. All of the sudden I'm eating & start feeling extremely nauseous & having shortness of breath. I decides to save my food & continue around the mall. Then my knee starts aching & throbbing so I began limping as it tightened & became stiff.

I just wanted to enjoy the day with my love & now its turned into my sitting down while he runs in to get Christmas gifts. Any other mommies feel like their symptoms get in the way of being able to enjoy themselves?

I'm only 28 weeks & not very big at all.