Hi Yael
I havent had that although i naturally have quite low blood pressure so i go get faint quite easily esp when blood sugars are low.
I would think if it is not a 1 off perhaps call your GP and ask them? It cant hurt to get their opinion although i have heard this is common in pg...
sorry not much help - hope feeling better
ps perhaps take some snacks in handbag for when v busy, i do that (muesli bar or something) and it helps.