Sometines it fells like my heart skips a beat and I lose my breath for a second then back to normal. Whats wrong?!

Skipped beat! This happens to almost everyone, more to coffee drinkers. If it happens more than 5 times in one minute, mention it to your primary care physician at your next annual.
Probably PVCs. You probably have premature ventricular beats commonly known as pvcs. It is an extra early beat coming from the lower chamber of the heart followed by a pause or delay after which there is a stronger beat. Sometimes patients feel like it takes their breath for a second. Usually not a concern but please talk to your doctor about it.