R.M.
I think I would definitely call your doctor and make an appointment...I would even share with the nurse what is going on in case they want to see you sooner, rather than later.
It could be a whole host of things...inner ear issues ( although that wouldnt explain the feeling of "numbness")....sinuses, low blood pressure, and I am sure a ton of other things that I have no idea about.
As I have said to others before...this is NOT the forum to come to for serious health issues...we are not professionals and sometimes some of the advice I see being given to some of the questions really scares me a little.
You need to see your doctor who knows your medical history and had the knowledge to really help you solve this.