My heart rate jumps from 60-100 bpm for no reason. my ekg, blood pressure, and heart scans were normal. what's causing my heart to race?

No reason?: You say "for no reason" but, no doubt, there is a reason. It just hasn't been discovered yet. Heart rate picks up in response to increased metabolic demand - stress, anxiety, fever, caffeine, nicotine, pain. There may be internal factors you're not aware of: indigestion, gall bladder, infection; A search for all the causes can be exhaustive. Meanwhile, a heart rate of 100 is not harmful.