Sometimes when i stand up, i feel dizzy, my head feels heavy and i can hear my heartbeat in my ears and my heart skips a beat?

Not uncommon: Is this your only symptom? Are you otherwise well? How fit are you? Are you adequately hydrated? Is your blood pressure normal? A skipped beat can be common, but it probably deserves to be checked completely with an ECG. But feeling woozy right after standing, is not uncommon, but should not normally be a huge problem. I would get a good check-up by a doctor.