Over The Course Of 5 Months I Have Experienced The

Over the course of 5 months I have experienced the following. First, fluttering in the heart, followed by an instant where you kind of lose conscience only for an instant. Today I experienced the worst. I was blow drying my hair, when I felt the flutter in my chest followed by a pressure to my head and coming close to fainting. I knew I was going to drop so I rushed to my bed and placed my hand on the bed which kept me from dropping to the floor. It left me as quickly as it came, but it was scary. I have been diagnosed with svt. What do you think may have happened?