I'm feeling lightheadedness about 10 times throughout the day. And that's every day for the last 10 days or so. I had vertigo before but this feels a little bit different

I put a heating pack on my face and head for the sinus congestion which made my head feel really funny I feel if I eat and I feel better temporarily. A teaspoon of sugar really helps make me feel better. I've had my sugar checked about three months ago and everything was normal then.My blood pressure is higher than normal. I'm really used to having low blood pressure and it's in the 140 over the 90 range.