I have had the same symptoms for 2 years. I finally found out that I have Migraine and Vertigo. I rarely have headaches, mainly dizziness and foggy feeling. I ended up going to a doctor that my ENT sent me to. It was a clinic for hearing & balance. They did an "audio VNG". It is about a 2 hour long series of tests that can narrow down the reasons for the dizziness. It will check for inner ear problems, etc. The tests are pretty intense and make you dizzy on purpose while they put goggles on your eyes that have cameras inside. The reaction can tell them all kinds of different things. They gave me a diet plan for migraines which seems to help and I don't need medication. They told me try it for 4-6 weeks and if it doesn't work they will prescribe me migraine medicine.
I hope this helps. If you want a copy of my diet plan to try or any more information, I would be more than happy to give it to you.
That's ORTHOSTATIC vitals. I never made it to the finals in the spelling bee.
You really need a proper medical evaluation ASAP by a hospital. The good news is I can think of a dozen probable causes for this, none of which are fatal and all easily treatable. But you do need an immediate work-up. Have your physician take othrostatic vital signs. He will know what you mean.