Hi
Thanks for writing to the forum!
Dizziness could be due to postural hypotension (blood pressure falling with change of position), internal ear problems and cervical spondylitis. All these cause dizziness when you get up from lying down position. Cervical spondylitis and ear problems also cause dizziness on changing the position of the neck.
Other causes of dizziness are anemia, GERD, hypoglycemia or low sugar and some endocrine problems.
Please give some more details about your condition for us to understand us better.
Hope this helps. Please let me know if there is any thing else and do keep me posted. Take care!
Does it happen all the time? How long have you felt like this?