Dizzy spells anyone?

I've been having an increasing amount of dizzy spells as my due date nears (I'm about 37 weeks now) and its like when you stand up too quickly and your blood pressure drops except way worse and itll just randomly hit in the middle of cooking dinner or brushing my teeth and I'm not sure what the deal is but its getting more frequent. I almost pass out and feel like im not getting any air. The Dr said baby could be squishing a vein periodically. Anyone else experience this? Have any ideas?