Is this V-tach?

[Eleo11]

For a couple of years I've been having a lot of extrasystoles. Usually right after exercise, sometimes in rest. I've had a holter and a bike test but the doctor said everything was fine and I have a normal heart.
Since a couple of months I've been having short episodes of something that feels very differently. I'll be sitting at my desk, or talking to someone, feeling completely normal, and then suddenly my heart starts beating very irregularly. Not like extrasystoles when it skips a beat but there's still some rhythm, but just erratic. It scares the hell out of me. But it only takes like ten seconds max, and then it stops and my heart is calm again.
Is this V-tach? Is it dangerous? Should I do anything?

[researcher09]

VT usually result in fainting.  What you described sounds more like PAC's since it stops so soon after you notice it.  There is a smart phone app that you can get for $75 called Alivcor if your condition sustains longer and it could be AF.  AF is not acutely dangerous but you will still want it taken care of since it could progress towards increased stroke risk and the need for medications that usually are ineffective or worse over the long term.

[CFS56]

V-tach is usually a regular, fast, rhythm.  There is no way to tell what you are feeling without it being caught on an EKG or monitor.  I would guess it's some kind of ectopic beat.