Could it be something bad if I have dizziness?

Potentially yes. You would need to consult a primary care physician before referring to cardiologist or neurologist depending on the outcome of the test to narrow down the cause of dizziness.
Yes. Dizziness can be caused by a number of problems. Usually it comes from a viral infection of the inner ear. Chronic dizziness can also be a sign of an underlying problem such as stroke, brain tumors and blockage of major neck arteries. Consultation with your physician for dizziness that does not resolve is essential.