See an internal medicine physician.
If you have problems with sinus infections, etc, then see an ear, nose, throat physician. It could be an inner ear problem causing the vertigo.
Finding out the cause is important.
If you have what is referred to as "positional vertigo" you can Google "exercises for vertigo". I think the exercise for this is called Darth Brandt or similar name. This exercise does work for this type vertigo.