What is your age?
How has your health been recently?
Do you know your blood pressure?
Does the room spin?
Do you take any medication?
There are two main reasons for your symptoms. The first is low blood pressure, this is less common in a young adult unless there is dehydration from excess exercise or an underlying infection.
The other possibility is that this is an inner ear disorder, this can be commonly associated with head colds or an infection in the apparatus that controls balance. Treatment is short term use of medication to stabilize the dizziness (betahistine)
I would recommend that you see a doctor. He/she can check your blood pressure and then evaluate your symptoms for the inner ear problem before arranging appropriate treatment.