What Causes Dizziness?

I blew my nose this am... my right ear seemed to "pop".. i immediately got dizzy and could not stand up nor walk straight... broke out in a sweat and was feeling sick....I did make it to my bed to ly down to whick i felt better after a while.... but even now while sitting up now I feel a little dizzy.... no real pail in my ear right now...... Should i be alarmed?