There have been three times since spring this year where my heart started beating a little funny and then i got a little dizzy or lightheaded. worry?

Needs evaluation: Could just be anxiety or dehydration, but i would worry about a possible dangerous arrhythmia and would recommend an evaluation. If it happens again, check your pulse immediately. Steady or irregular? What's the heart rate? (# of beats in a minute). Practice this when you feel well so you know what it should feel like. This info will help your doctor in the evaluation. Meanwhile, avoid caffeine.