Thanks for writing your query.
The cause of your dizziness
seems more towards ear problem resulting in postural vertigo as indicated by you that your diziness increases on moving your head.
You should get yourself investigated and examined by an ENT specialist
Also get yourself investigated for following :-
1. Blood Sugar (Fasting and PP)
4. MRI Head and Neck
25 mg thrice a day or Betahistine
16 mg thrice a day will be helpful if the dizziness persists and if low blood sugarlevel is not the cause of your dizziness.
I hope this is helpful to you.