Concerns

Elle
Hi all,
27 weeks today and at work. I was sitting at my desk, after just finishing up lunch, when I was hit with a massive bout of nausea, dizziness, blurry vision and shortness of breath. I felt like I was going to pass out! 
It lasted about five minutes but I was left with a bit of swelling and tingling in my legs. Anyone experience this too? 
I have an appointment with my OB next week but should I pay him a visit sooner? Or am I just being pregnant and paranoid?