Super dizzy

Has anyone been super dizzy when pregnant? I am 20 weeks and it just started this morning. It seems like whenever I stand up or turn it's really horrible, everything is swirling and I feel like I'm going to pass out. I am fine if I'm sitting perfectly still but that's not very realisitic. I was able to get down a little food and water, so I don't think it's low blood sugar or dehydration. Has anyone else dealt with this and do you have any tips or tricks?