Have you seen a Neurologist? That sounds like a neurological problem. The dizziness upon changing positions sounds like something called orthostatic hypotension. That is when the blood pressure has a significant drop when a person changes positions. Do you have a blood pressure cuff? If so, take your blood pressure, lying, sitting, then standing. If it is a significant difference, then this is the reason you become dizzy. I am not sure what the numbness is all about, but it sounds neurological. Go see a Neurologist, and they will assess you from their prospective.
Hi
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This can happen due to due Vit D or Vit B12 deficiency, ankylosing spondylitis causing multiple pinched nerves, or due to sciatica which happens due to pinched sacral nerve root.
Get the blood levels of the above checked. You would need to consult an orthopedic specialist and the treatment will involve medicines, physiotherapy and maybe surgery if need be. MRI of the spine should be done. Please let me know if there is any thing else and do keep me posted. Take care!
I wonder if you have a problem with circulation in your blood flow. But any symptom could trigger this even if it is as simple as your wisdom teeth coming in; as an example.