How to stop feeling faint?

Nikki
Hi all 
I'm 10 + 1 and after the first few weeks of feeling pretty good over the past week I've started to get quite dizzy and light headed and feeling super sick. I've not passed out but I have felt like I'm going to. My blood pressure is fine.
If this is happening to you do you have any advice on how to combat it? 
I haven't told anyone at work yet and this is happening at work so a bit awkward! 
Thank you