I experienced a really big flutter in my chest and felt very light headed. it didn't last long, should i be concerned?

Maybe: Symptomatic palpitations can be due to an array of medical problems . You should see your doctor. Get labs including ectrolytes thyroid function etc. Your dr may order a holter or event moniter as well. An echo of the heart will help evaluate the structure of the heart . Things like mitral valve prolapse or poor functioning heart can be checked. Some times a stress test or eps is needed.