What could cause rapid breathing, dizziness and cold sweats in you?

Hard to say. The symptoms are consistent with what is known as a panic disorder. This is a real phenomenon related to increased secretion of Epinephrine in the brain. You need to rule out anxiety/depression. The latter symptoms are often associated with dizziness and there are neuro-anatomical reasons for these symptoms. See your pmd and have a specific diagnosis and be placed on appropriate medication.