Hello, The dizziness when you do certain head movements or when you lay down is very likely due to BPPV (benign paroxysmal positional vertigo). This is a condition where small sand-like stones collect in the fluids at the area of the ear that is responsible for the balance and cause you to feel dizzy with certain movements. A visit with the doctor will easily diagnose this condition and the doctor will be able to treat you in his office with Epley maneuver (which helps relocate the small calculi, improving your symptoms). I hope this answers your query. I remain at your disposal for further medical assistance. Regards, Dr. Antoneta Zotaj General and Family Physician